Another 'B' problem

[Avery Todd]

List,

While we're talking about B's, any ideas on how to stop the hinge pin that 
connects the soft pedal connections under the keybed from working out? 
Sorry, my Merle Mason book is at the school and I'm not and I can't think 
what to call everything. The pin that connects the wood piece that goes 
between the two blocks that are screwed to the keybed and moves the action 
when the shift pedal is depressed.

I know I could put some kind of "dam" there to prevent the pin from working 
out but is there a more "authentic" way, short of plugging the hole and 
drilling a new one?

Thanks,

Avery Todd

P.S. Man, you'd think that after 30 yrs............