I decided to see what I could do about the temporary modification to the Burroughs C 3207 multiply key indicator, before it became a permanent modification.

After thoroughly checking out the multiply key construction. I decided that the only way to access the indicator light was going to be from below the keycap. I verified that there weren’t any setscrews or pins fixing the keycap to the shafts, before using some parallel wedges under the keycap. The cap is attached using two flat shafts and springs, and is attached very securely. After using quite a bit of force evenly distributed across each end of the cap, it started to finally move.
I had thought that I had cleaned the keypad assemblies fairly well before, but was a bit surprised to see how much garbage still remained, which was mostly grease, and dust.

I was expecting some type of standard miniature incandescent 24 volt bulb, but was surprised to see the odd little bulb assembly attached between the shafts.


The bulb of this lamp assembly is housed in a Bakelite molded fixture with two metal tabs that are used to support the assembly and supply power to the bulb. The backside is potted with a similar color powdered mixture to seal the connections.
After some searching I was unable to find any type of bulb that matched this unit. It would probably help if I knew what to accurately name this type of fixture.

It didn’t look like I was going to quickly find a replacement bulb, so I once again put together a semi-temporary or maybe permanent fix for the multiply key indicator.
I knew that the original LED solution worked well, but caused a lot of light where I didn’t want it. So my solution was to shrink it down to fit into the same space as the previous bulb fixture.

I ended up selecting a 10K Ohm 1/8 watt resistor, and used the LED’s anode lead and the resistor lead to attach my assembly to the terminal screws. This worked well, but in hindsight a diffused instead of clear LED would have been a better solution.
I took nearly as much force to press the keycap back onto the post and springs, but when completed, everything looked as it originally did.
I would still like to get an original bulb back into this unit if anyone knows where to find one.