[Ronnie]

The problem is multiplied when the stand head has poor quality control and lacks good assembly tolerances.If you read my post carefully I state " this only complicates the stress on the engine contact points". That is all I said.Nothing about slop in mechanisim.
I am referring to all arms being the same dimensions and tolerances. which is not the case in many cheap stands.I have no problems with your statement about stress concentrations when all other tolerances are adhered to.

R