I have tried various things to hold the ramrod hole drill in the channel. I currently use leather strips that I wet and wrap tightly around the forearm and drill bit. I then let it dry and tighten up. It works better than anything else I have tried and it is very simple. The really important thing is to make sure that the ramrod groove is perfectly parallel to the bore, the drill fully seats in the groove, and the hole is started without drifting at the very beginning. If you get any of the these first three things wrong, you can't correct later. It is sorta like making a saw cut with a hand saw. If you start the cut right, then all you have to do is let the saw follow the cut.
