I was more thinking of either oversizing the roll pin, twice the size will mean however much extra surface area but will weaken the shaft as the hole will not have as much meat around it.
Or using the hole thats allready there, enlarged a bit. Grind flats on the boss and drill clean through one side of the boss and the shaft and then tap a thread in the other end of the boss and put an extrenal lock nut on it. Perhaps i could get a 6mm cap head screw in the hole. So then you have the pin arrangement with the clamping as well.
Whatever i do, i will have to be able to assemble it to get it back on the machine.
Cheers, Bob.
