Worm Gear Replacement
Worm gear replacement is major overhaul. To change it
requires EXTENSIVE disassembly of the mechanism (once it's removed
from the projector of course!). Once you start dissembling the
mechanism you lose all the critical adjustments which require the
special (expensive) Bell & Howell tools & jigs to readjust/realign.
The new gears are colored black to distinguish them from the old
Images used with permission. Copyright 2006 Ken Layton. All Rights Reserved.