I'm taking a heavy 9 gear box apart to clean and install new felts. I've done a 16" box so it's pretty much the same. Except I'm trying to take the jam nut off the cone gear shaft. The 16" and 10" lathes have a pin through the nut. There is no pin I can see in the 9" box. Is there something else holding it on? I've jammed an oak wedge in the gears and hit the end of my wrench with a dead blow hammer, and the gears chew the wood up before the nut lets loose. I'm a little hesitant to put a metal block in like Eric Isom shows in his excellent tutorial. If there is nothing else holding the nut I'll figure out how to hold the shaft better. Thanks for any help.