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Po-
The heads are undersized and shallow so if you have a balled Allen key you can wreck them easily. Best to use a high quality Allen bit in a torque wrench. Threadlock is helpful too...
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Actually Chas is right, I believe higher series Shimano chainsets have preload caps made of alloy, not plastic.
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Yes, the crank arm fixing bolt are made from plastic but Shimano do have metal alternate options though for the higher end stuff.
That said, it's a preload bolt and does nothing IF the crank arm bolts are done up to proper torque.
Howard
pifko
coventry_eagle
Plastic as in a soft alloy?