[ARC5] ARC-5 Transmitter questions

[J. Forster]

Does anyone know if there is a supplier of replacement plastic windows for the
roll-a-ductor in the ARC-5 Tx's? Mine has shrunk with age. It would seem to be a
pretty straight forward thing to make, since it's a piece of clear plastic (
probably acetate)  with the white markings screened on.

Also, the bottom cover of my Tx has mill markings "ALCOA" and "3S-1/2H". Does
anyone know if this is an original cover, or if it's someone's home brew
replacement? It's nicely made with the original type screw posts. I would be
surprised if the red ink mill marking would have survived the factory finishing
process.

TIA,
-John