Well, Mailman, my XS2 speedo is being a son-of-a-gun. It hasn't been cracked open, but there's a history with the trip knob. Looks like it was glued on, and I had to make a puller to get it off.
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The knob looks good from one side, some mangling and clutch cable rubs on the other side. The inner flat is gone, probably why it was glued.
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The aluminum shaft extension won't unscrew. Studyin' this part, there's a tiny access hole. Got some penetrant in there, may need to cook-up a tool.
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Worse case would be a destructive entry. But want to avoid that, save the shaft extension...