What am I doing wrong?

I've got a good set of Selma FID's, new Donaghy's Double Braid, but I just can't get a good eye splice with the cover back over the core over the cover?

I'm having trouble getting the FID with the core back through the cover far enough past where the core first exits. Is there a secret?

This then seems to then stuff up getting the cover back over the core for the finish on the eye.

I've watched a few youtube videos as well as the following the Selma guide, that seem to show it as an easy process, but for me it is just not working.

Am I missing something?

Ah yes, for difficult problems you often need lubricant... I prefer the red type myself

Imagine what you could've achieved if you consumed the whole bottle

Well it's my turn to get frustrated next. I have just purchased a few hundred meters of double braid with the intention of replacing most of my lines and having spliced ends.
In the past I have whipped and stitched my ends but splices are so much better.
It seems I forgot a very important ingredient, better get down to the bottle shop. Do they sell red by the gallon ?????