Thanks everyone all good ideas,
the lock rack arm (front r/h side )came out because I didn't keep pin /locking arrangement lubricated and free .I 've been rather busy of late and was rushing to get packed and down the coast for family holiday..In my haste I didnt check locking pin hadn't extended into hole position leaving arm to work it's way open allowing board to lift and bend rear arms eventually flying from car. All my own fault and If I can offer any advice spray a little wd40 around pin and keep it free.