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IIRC even if you forget to torque the bolts (!) the safety catchy doobry prevents total destruction of crank.
Nah, the "safety catch"(it's just called 'Plate' in the instructions) is just there to add friction to the clamp bolts, like a Nyloc, to reduce their tendency to loosen in service. If the clamp bolts have too little tension, the splined interface oscillates under load and since the axle is steel and the crank aluminium, the crank tends to get wrecked first.
gbj_tester-
Interesting - I thought the pin on the plate interfaces with the spindle, preventing - perhaps a bit optimistically - the arm rotating around the spindle over the splines, which is where I'd imagine the catastrophic damage to occur. Having it rocking around loose on the spindle isn't going to do the arm any favours, either, I know.
Howard
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.