[Hallicrafters] SX-28A main tuning question

[dlcooper at sue-doug.com]

I think I am missing something on the main tuning concentric shafts. The
knob just spins and does not move the tuneable caps. When I received there
was a small brass ¼” piece of brass fastened to the end of the center shaft
with a sheet metal screw. Since I have never restored one of these, I do not
know how it should be constructed. Either the shaft was broken off and the
owner did this quick fix or the screw that holds the ¼” piece was broken and
they chose a sheet metal screw. The inside of the center shaft seems to have
threads and they may be 2/56 but they are so buggered from sheet metal screw
that I cannot get a 2/56 started. Can someone tell me how this should be
constructed. Doug Moore’s article has a photo of the shaft but it is not
clear enough to answer the questions. The back side of the shaft has the
proper pressure washer and shim against the flywheel.

 

Douglas Cooper

Adjutant – Sons of Confederate Veterans, Camp 1475

Ham Radio – WA4JSS

Phone or Text – 540 871 4550