Shopsmith Forums

You are absolutely correct. But if this roll pin gets mushroomed while trying to punch it out, there is no way to get to it. It is "buried" within the casting.

If the proper size pin punch is used, the roll pin tends to mushroom IN.

If a cone(pyramid) shaped nail is used, the pin tends to mushroom out.

As Heath pointed out, the nails be softer than the pin and are more likely to be deformed than the pin.

However the aluminum casting is softer yet. The pin punch prevents scarring of the bore.

Does the pivot need to be in any particular position to remove the roll pin? I can’t see that there is room behind the roll pin to punch it out?

On older Benches for the Mark V the Base and Arm are held together with a rod called the Base Arm Pin which uses a Roll Pin as previously described in this Forum thread. The Roll Pin is pushed through the Base Arm Pin and Base Casting which then falls out the back from inside the casting. The Arm does not need to be in any particular position to remove the Roll Pin. As rdavidp reported the Roll Pin can easily disappear after coming out if not watched carefully.

Later Base and Arm Assemblies have a Base Arm Pin that is kept in place by two retaining Rings. I don't know when this change occurred but my 2001 Mark V Bench has this. The two Retaining Rings are up inside the Arm Casting.