On 31 Dec 2012 at 9:54, J. Forster wrote: > There are plastic knobs from old consumer radios which do work. In many cases, a piece of 1/4" copper tubing can be driven over the splines. Then a common 1/4" knob with setscrew will fit. The spinner knobs are not really necessary if you already have a control box and "cables". Ken W7EKB