| Checked my old (1952) Gilera Saturno out before it's MOT in September-rear light not working. Bloody bulb thinks I taking the lens off-not the bulb, the whole dam light unit, bulb holder the lot was missing-must have vibrated off. Put a modern LED type inside the old housing-looks standard still but that 'bulb' will never blow.
John | 
Monty
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