My '76 used to unscrew the knob (button) on the handbrake quite regularly. The spring below it would then send the button off into a (usually passenger) footwell.
Eventually a tiny dab of Locktite stopped further escapology. smile

Graham (G4FUJ)

Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW