Re: Window Crank Knob Off
Posted by HH56 On 2014/5/4 21:14:54
I don't have a handle exactly like yours but suspect the 47 may be of the same construction with a different shaped knob. Taking an old damaged one apart, the shaft appears to be a one piece item with a knurled section in the plastic and another smooth section in the handle. The shaft has a flat section which would in effect be a washer on the knob side -- goes thru the hole in handle and then the handle end of shaft peened or riveted over. The knurled section is .220 and then gets slightly smaller -- maybe .187 although I could not measure it without taking the shaft all the way out.
No idea how plentiful handles would be in your color but am sure used ones are out there.
If that is not feasible, a possibility on yours is to remove the knob and then take the shaft out and see if you could enlarge the hole in the handle and knob. Along the lines you mention, use a slightly larger shaft made from a screw. It would take some experimenting to get everything just right and to fit in the knob. Another option might be to get the prewar shaft piece from Yesterdays Radio and see if you can add a bushing to repair the slop or whatever is needed to adapt the shaft to your handle. It looks as if the shaft would need to be shortened slightly and it probably would glue into the knob with epoxy rather than have the molded or knurled attachment. If you went with a screw, glue would probably need to happen there too. Looking at the premade shaft, I wonder if a threaded round standoff from McMaster and an ordinary screw could be made to work.
Borrowing a snip from Yesterday's Radio catalog you can see he has new knobs and what the shaft looks like. If you are careful you can probably remove the shaft from yours and reuse the knob. I heated the shaft rivet head ONLY with direct heat from a very small butane torch. Once the shaft was heated, plastic softened slightly & I could pull the knob off. I think it would go back on the same way with no difficulty.
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No idea how plentiful handles would be in your color but am sure used ones are out there.
If that is not feasible, a possibility on yours is to remove the knob and then take the shaft out and see if you could enlarge the hole in the handle and knob. Along the lines you mention, use a slightly larger shaft made from a screw. It would take some experimenting to get everything just right and to fit in the knob. Another option might be to get the prewar shaft piece from Yesterdays Radio and see if you can add a bushing to repair the slop or whatever is needed to adapt the shaft to your handle. It looks as if the shaft would need to be shortened slightly and it probably would glue into the knob with epoxy rather than have the molded or knurled attachment. If you went with a screw, glue would probably need to happen there too. Looking at the premade shaft, I wonder if a threaded round standoff from McMaster and an ordinary screw could be made to work.
Borrowing a snip from Yesterday's Radio catalog you can see he has new knobs and what the shaft looks like. If you are careful you can probably remove the shaft from yours and reuse the knob. I heated the shaft rivet head ONLY with direct heat from a very small butane torch. Once the shaft was heated, plastic softened slightly & I could pull the knob off. I think it would go back on the same way with no difficulty.
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(27.45 KB)
(25.05 KB)
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