Triumph Window Regulator Mechanism TR4 - TR4a - Left Hand Side 850400
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Window Regulator - Left Hand Side Triumph TR4-TR4a - 850400
Triumph TR4-TR4A Door Glass and Window Regulators
If the handle is floppy all over the place and the lift of the glass is 'notchy" then you need to replace this mechanism.
To suit vehicles:
Triumph TR4
Triumph TR4a
TR Register