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The pin's about 0.5mm ø - not going to stop anything given the forces on the crank spindle. I always thought it was more to let you know you've got the cranks in the right position since if you don't, the pin won't engage into the hole in the spindle and the plate will be in the way when you try and insert the clamp bolts.
I'm surprised the plate serves any purpose other than to stop you fitting the cranks in the wrong position.
rhowe-
I'm surprised the plate serves any purpose other than to stop you fitting the cranks in the wrong position.
Yeah it's not obvious really. I think it can prevent over tightening of the pinch bolts too.
I had an XT arm come loose - it wandered down the spindle pushing the preload bolt out as it went until the pin stopped it. Maybe :) Pushed it back on, re-torqued it and it's been fine ever since.
Howard
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.