Cool

I'll give it a go...was a little concerned about getting bits of wood in the engine, but 800C combustion temperatures should make fairly short work of any bits of wood that might get stuck in there....

I was also a little worried that I might do some damage to the crank, but thinking about it a bit more logically it is likely the wood will fail way before the metal is twisted, or damaged in any way. If a M8 bolt can take a couple of ton of force, I reckon a crank should be able to handle to 200Nm or so of torque required to undo the crank.

Thanks again for the advice, I'll have this engine built one day...