Well I must commend you on your determination, working on that radio in a hotel room! Lucky that you had access to a lathe. I don't know anyone who has one, but perhaps I can find a way to manage it. I'll hopefully have some time tonight and tomorrow night to disassemble the gear mechanism. I'll update the group with my results.
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As a backup plan I'll scavenge the mechanism from my FV-301. It's just a show-piece now anyway. Can't imagine anyone needing to work split today with one of these old beasts. (wanting to - that's another matter!)