Okay for all of us who have those vintage framed amps we all know how difficult it is to remove and replace those frames especially with VTA, if you need access to a triode and pentode switches. Find a screwdriver and then carefully remove 4 screws without scratching the nickel plate or stainless steel surface, then try not to lose the screws. But these thumbscrews are the answer. The perfect size so nothing gets damaged or shorted out internally. My ST70 was an early version between 1959 and 1963 so self-tapping screws were used, but a quick pass with a tap or just a 6-32 screw and you're done. In hindsight I would have preferred a steel thumbscrew to an aluminum one as I could see how the threads could easily cross when screwed into steel or simply wear out, but I knew that when screwed in and with a little care they should do all the way Life. Highly recommend and they look great.
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