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yeah HTII.
Interestingly the plastic compression cap was missing but AFAIK that's only for compression prior to tightening the bolts. In theory you could take it off once the bolts are tight.
waits to be told I'm completely wrong
Anyway, bit of a shitter because he had to walk to the nearest station and take it up with Halfords as to why his Ultegra cranks have been destroyed.
fizzy.bleach-
Hollowtech 2 are pretty solid, I would wager installation error especially given the timescales.
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In theory you could take it off once the bolts are tight.
Once the pinch bolts are tight it's pretty fricken' hard to get it off. Ever tried it?
IIRC even if you forget to torque the bolts (!) the safety catchy doobry prevents total destruction of crank. Maybe they lost that, too.
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It's hard to take off the compression cap once you tighten it and the bolt, it sound like the "technician" forget to put the plastic compression cap after putting the crank on, and since he forget that, i would very much wager this is not a workshop to be trusted with something you can learn from reading up the Shimano technical document online.
TM
Howard
edscoble
If they didn't tighten the Allen bolts correctly, just the compression bolt thingy?
(I take it you mean hollowtech 2, if hollowtech 1 then possible they misaligned the splines then torqued it up misaligned)