[GreenKeys] [External] Model 33 parts

[Jones, Douglas W]

From:  Eric Moore [mooreericnyc at gmail.com] -- Friday, January 20, 2023 8:31 AM

> The top cover plastic has broken,

Testors liquid plastic cement works on the plastic, making bonds just about as strong as the original.  You can buy an ounce or so at any hobby shop, and it only takes a few drops.  What takes time is setup.  You need to clamp the broken pieces in the correct relationship to each other and then use the brush applicator to run the solvent into the cracks -- capillary action will pull the solvent into the cracks.  Then let it sit for a day so the solvent can evaporate.

> and the clear window is badly cracked. 

Replace the window.  You can buy plexiglass (I bought a piece at an art supply store).  I cut the tapered edge with a carpenter's plane (clamp the plexiglass between pieces of wood pre-cut to the correct angle, then plane the exposed edge.  The planed surface has a frosted surface, but brisk scrubbing with a Mr Clean polishing pad made it crystal clear.

My whole experience repairing a 33 cover is documented here (follow the links for more detail):

-- https://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/bugs.shtml#17

            Doug Jones
            jones at cs.uiowa.edu