Just when you thought tuning knob threads were over for good, here is another. This time for my K1. I like large knobs. My friend had a HRO 500 with a tuning knob the size of a kids wagon wheel. Just right. The K1 knob is 1.25 in. in diameter. My Sierra knob is 1.50 in. in diameter. It looked like there was room for the larger knob on the K1, so I removed it from my Ten Tec 1340. (I have a National Velvet knob on my Sierra, I said I like large knobs.) Perfect fit. I was thinking maybe it would interfere with the clear plastic tuning indicator cover but it just cleared that and everything else. The knob is the same except for the larger diameter. I had recently changed to 150 khz tuning range (178 khz actual) and the new knob gives finer control. Know I have a small knob on the Ten Tec 1340 but it only has a 35 khz tuning range, so no matter. 73 Rick Dettinger K7MW
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