Well thanks much guys - there's a Harbor Freight within a mile from the house. I'm developing 3 sets of tools - auto / home / RC - and I keep promising myself that I won't borrow from one to feed another (yea, right!).

Bottom line - create a snug (not tight / not loose) fit between the clevis' pin and the horn. Best tool set would include digital calipers, drill bit sets and a sense of humor.

Now if the shipment of bearings would just show up! Time to fly.