hey mstam,also ,when you go to remove to prop stud,after you find a deep thin wall socket,,you can move the piston to allmost tdc,the put some oil in the cylinder replace the plug and the piston wont move ,it will be hydraulic ally locked ,this way the load is spread across the piston as opposed to using a piston stop or a piece of plastic in the exhaust,,,if the stud comes off easily ,it may give you an indicator that things were not properly tightened at first,and as you allready know,,if that prop hub has been wiggling ,it need to be replaced.