You might remember (or maybe still have to fix a few) the oil filter bolts on the old single cam Hondas. They were fitted with a 14mm head intentionally to stop you tightening them too much - they only had to hold the oil filter cover in place - but because they were big bolts they were habitually overtightened to the point where the bolt head rounded off, and next time you couldn't remove it.

The fix? - an aftermarket bolt with a 17mm head. That could take a really big spanner which then cracked either the cover or the crankcase.

Chinese spec "stainless" drain bolt, missing or re-used ten times aluminium washer, tightened with a ten foot bar to make sure it doesn't fall out then torqued with wrench last calibrated in 1984 = one careful owner, full service history :rofl:

Andy

But how many careless owners?