Not just VCR presumably but this mechanism is in a VCR. A plastic latch mechanism on the end of some slide bars that is delatched when a motor is spun up with a small "star" cog on the shaft, latch engages region of "star" when not spinning. While at it I ask every now and then if anyone knows of a UK/USA tool terminology translation file Allen key / hex key spanner / wrench mole grips / lock jaw pliers etc
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on