You might consider a trip to the hardware store. My Tek 453 had the same problem with his feet. I found some metal drawer pull knobs that looked like they might work. I drilled them out for 10/32 size screws, which is what the original feet used. They may not look like Tek parts, but they don't look outta place.
Burt, K6OQK
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Sent from my Android thingamabob with K-9 Mail. Please pardon the spelling errors as the dog can't spell so good.
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Burt I. Weiner Associates
Broadcast Technical Services
Glendale, CA 91201 U.S.A.
K6OQK
Burt K6OQK