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Severne enigma

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Created by Nerdburger A week ago, 11 Mar 2019
Nerdburger
NSW, 133 posts
11 Mar 2019 10:12PM
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g'day.

I've have 3 engima wave booms 140-190. Always loved them, stiff, light with great fittings.
Its come time to shim the head, as it's starting to feel a little sloppy on the boom.
Ive tried tonight, but the nut keeps spinning in the plastic head of the clamp.
It's either corroded or too much thread locker !, or both !
Any secrets for getting it undone without damaging the red plastic hinge??
ive tried, a small flat blade screw driver to
wedge the nut no luck so far, WD-40. I can't remember ever having this problem before ??, any advise ??

kato
VIC, 2408 posts
11 Mar 2019 10:36PM
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Drill two holes into the nut on opposite sides. Start small and go as big as you can. Your trying to split the nut but not damage the bolt. Wedge in a Std screwdriver to crack it open. Unscrew . A freeze spray might help too

olskool
QLD, 1113 posts
11 Mar 2019 9:58PM
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How do you shim the head? Ive got a Gaastra head thats very loose.

Relapse
VIC, 275 posts
11 Mar 2019 11:08PM
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The guys at Zu Boardsport got mine off when it was doing the same. Can't remember what they did but worth giving Paul a buzz.

I just gave mine a couple of coats of West Systems Epoxy to tighten things up again.

wind012
WA, 124 posts
11 Mar 2019 9:12PM
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If the nut is spinning, then fill with around edge of nut with araldite, wait, then remove bolt.

Hope that the head shim is worn not the actual carbon head.

The red clamp lever is already damaged so why not replace for $5 or so?

Then either:
a) buy new head shim and new clamp lever, or
b) buy new clamp lever and add thickness to boom head with bicycle tube
c) buy new clamp lever and add thickness to boom head like this ..

regal1
NSW, 74 posts
12 Mar 2019 7:20AM
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I've rung severne in wa and they sent me new boom bolts & parts next day.

robbo1111
NSW, 493 posts
12 Mar 2019 7:27AM
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Select to expand quote
regal1 said..
I've rung severne in wa and they sent me new boom bolts & parts next day.


Same. Great service as usual from Paul

Nerdburger
NSW, 133 posts
12 Mar 2019 9:00AM
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Thanks all, I don't like my chances of drilling a small stainless steel out nut, but the aralite sounds like a plan, if it doesn't do the job, I'll drill it out.
all good, I get the stainless nuts for bolt shop, easy as. Great boom, with heaps of thought into all, maybe a future update could see a better arrangement for this part ?
Shimming the head, I'll just clean out the sand and carbon dust, use elec tape to build up boom thickness and re assemble so the clamp doesn't have the previous play in it !!
thank you all !!

Brent in Qld
QLD, 138 posts
12 Mar 2019 9:13AM
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I usually deal with the issue of the nut-bolt spinning by grabbing the plastic around the nut with a set of vice grips to tighten or loosen. The plastic will deform, maybe bruise slightly, but I've never had it break or cause issue while sailing.


I replace the entire plastic head every couple of years. Recently the new head arrangement sat loosely over the carbon when fully tightened, its a sign the carbon underneath the head was excessively worn. Image below indicates wearing of 1.5 & up to 3mm in some areas, in my book thats too much missing carbon. So I bit the bullet & cut back the grip, sanded+prepped the area & rebuilt this zone with carbon.



This can be fixed by rebuilding the carbon and your good to go again. Images below are after laminating then sanded and head refitted with no more sloppy alignment. Structurally good as new again




Faff
VIC, 633 posts
12 Mar 2019 1:51PM
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One option


My enigma does the same. I think I'll try silicon tape on it.

My NP X9 boom head is still fine, OTOH. I wonder if the fact that it's a carbon head has anything to do with it.

HotBodMon
NSW, 280 posts
12 Mar 2019 5:21PM
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Wonder if the "galvonic corrision " applies to coke cans ?
Surprisingly my shonky push bike tube is still going strong , I had to laugh when wind012 suggested it as a second option- maybe it's not so shonky after all , at least there's no more clamp reaming

Brent in Qld
QLD, 138 posts
12 Mar 2019 4:46PM
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The shim probably won't be too happy for long, carbon has high conductivity & salt water is a great medium for dissimilar surfaces to get all worked up. In most the testing & real world stuff I've witnessed in the marine sector it will be the metal that suffers the quickest & most detrimentally. In this case the shim will be the first to crap itself. Only issue I can foresee is how long to leave the ali shim in place. If it gets sh!tty on the surface or the edges, it will likely fast track any abrasion of the adjoining surfaces during any rotation.

wind012
WA, 124 posts
12 Mar 2019 8:28PM
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Select to expand quote
HotBodMon said..
Surprisingly my shonky push bike tube is still going strong , I had to laugh when wind012 suggested it as a second option- maybe it's not so shonky after all , at least there's no more clamp reaming


I think your idea was great (although I have never tested)

The movement of the head must be minimal whilst sailing, so I think it will work well .. and afterall, the bushings on many booms are similarly just made of a similar flexible 'rubber' type product - take a look at the streamlined boom head for example.



Faff
VIC, 633 posts
Thursday , 14 Mar 2019 10:40PM
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Select to expand quote
Brent in Qld said..
The shim probably won't be too happy for long, carbon has high conductivity & salt water is a great medium for dissimilar surfaces to get all worked up. In most the testing & real world stuff I've witnessed in the marine sector it will be the metal that suffers the quickest & most detrimentally. In this case the shim will be the first to crap itself. Only issue I can foresee is how long to leave the ali shim in place. If it gets sh!tty on the surface or the edges, it will likely fast track any abrasion of the adjoining surfaces during any rotation.


I've used it a couple of times since. (It may be the lightest boom, but I'm used to skinny booms now and I don't like the shape when sliding my hand to the mast during gybes. It's a great boom for small sails with a lot of shape up front like North Heros... or any Ezzy sail.)

FWIW, this was the starting point. The boom was bought used, so maybe it's supposed to have some sort of shim. But if it's not, then the design is downright stupid - the head's sharp plastic ridges are bound to make grooves in the carbon.








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"Severne enigma" started by Nerdburger