From: owen (email suppressed)
Date: Sat Oct 13 2007 - 12:53:18 PDT
or just use your fingers to turn the lens to focus.
On Oct 13, 2007, at 2:08 PM, David Tetzlaff wrote:
> Eiki 'Slim Line' 16mm projectors (and perhaps other models as well)
> focus by means of a knob with a rubber collar on the end of its
> shaft that
> engages ribs on the lens barrel.
> The problem with this is over time, the rubber perishes and ceases
> to grab
> the ribs. In some cases is gets brittle and cracks. More often it
> seems to
> liquify and turn into a sort of goo. This is dangerous. I am now
> that just such a piece of goo migrated from the lens into the gate and
> destroyed a valuable print I projected a couple years ago.
> I have come up with a method to repair this problem, which takes no
> special skill, so i thought I'd share.
> 1. Remove the plastic cover over the lens housing, It just pulls
> off from
> the top.
> 2. Remove the lens housing: three small Phillips head screws, one
> on top
> two on bottom.
> 3. Remove the small screw in the rear slot holding the lens in the
> and remove the lens.
> 4. On the bottom of the lens housing is a metal bracket attached by
> very small Phillips head screws. Back these screws out, but do not
> remove them. The focus knob will now slide out of the housing.
> 5. Remove whats left of the old collar and clean up any residue on the
> knob, inside the housing, or on the lens barrel.
> 6. Obtain some large heat shrink tubing for 14/16 gauge wire and 10/12
> gauge wire. I used a package from harbor Freight Tools, catalog
> 96024-1VGA, www.harborfreight.com if they don't have a store in
> your area.
> 7. Cut two pieces of the smaller tubing to the length of the
> collar, and
> also two pieces of the larger tubing.
> 8. Slide a pice of the smaller tubing (red if its Harbor Freight)
> onto the
> end of the focus shaft as far as it will go. Heat it with a kitchen
> or range burner from an inch or so away until it shrinks tight onto
> 9. Let it cool, then add another layer of the same size tubing
> (red). It
> should fit over the first layer after that one has shrunk. Again,
> heat to
> 10. Add two more layers using the larger (black from Harbor Freight)
> tubing, again shrinking with heat.
> 11. This should build out your new plastic collar to just about the
> diameter of the wider part of the shaft
> 12. Reinsert the shaft into the lens housing. Line up the slots in the
> shaft with the two small Phillips screws you losened earlier. Tighten
> these screws, making sure they go into the slots and do not bind the
> shaft. The shaft should rotate freely when you turn the knob.
> 13. put the lens back in the housing. Hopefully your new collar will
> engage the ribs and rotating the knob will move the lens back and
> 14. Reassemble the lens housing in reverse of the disassembly above.
> Hope this helps somebody somewhere keep a projector in service.
> For info on FrameWorks, contact Pip Chodorov at <email suppressed>.
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.