Jerry,
I was considering a pin in the root of the tooth of the Feed Gear at each cartridge slot and a matching slot in the tooth at each chamber in the ring gear to aid in the initial timing when the magazine is loaded. This would assure that any slot would line up to any chamber when the magazine is first installed. It would not exclude mistiming until the gears were rotated however.
Also I ordered the brass yesterday for the magazine and I have the Delrin around somewhere if I can just find it (likely end up buying it as well). Looks like you used a Shoulder Bolt for the Feed Gear Shaft.
I will have to put the gun on hold for now, I leave for Cuba on Friday and have a pretty brutal travel schedule for the next couple of months.
gary