Stripped threads!!!

If you have stripped the threads they can be easily repaired

with either the heli-coil or time-sert thread repair systems.

The time-sert is the prefered option.

I'm pretty sure they should be tightened to 20 Nm not 20 ft/lb quite a significant difference in torque

Right. The spec is 23Nm or 17 ft/lb.

You will have to have these bolt holes Heli-Coiled, or red-neck it by drilling them through and using longer bolts with nuts on them. They're important.

Could you just tap it one size up to use a bolt one mm thicker?

Could you just tap it one size up to use a bolt one mm thicker?
Doing that tends to weaken the clamping area of the lug. It's best to stay with a Heli-Coil, and insert it from the threaded side so the top side is not drilled larger.

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