How to mend Bell & Howell 256 Ex

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Bell & Howell projector?

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Bell and Howell model 256 projector lenses?

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Repairing take-up reel drive shaft rubber wheel/tip - Bell & Howell MX43 ?

Bell & Howell Model 456 Movie Projector?

How can I fix my Bell&Howell 8mm multi motion projector?

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bulb removal?

Obtaing Repair Manuals?

How do I I replace the worm wheel on my Bell & Howell 644 16mm projector??