I'm like the other guy Bryce. I have a similar stereo by Magnavox. I bought mine brand new for Christmas 1971. The only numbers I can find are S 5982, LP3672.
I need to know the size of the small screw that holds the stylus on the phonograph arm.
Can anyone help or know where schematics might be located to give me the size?

Doug,
You might be able to get some help from these people....

www.garage-a-records.com

They sell just about every cartridge and stylus under the sun and are very knowledgeable. I have emailed them questions in the past and received help from them.

It's definitely worth a try.