[jrblasde]

Good afternoon, folks! Has anyone had experience replacing the FM oscillator trimming capacitor (C400C, part of the C400 assembly; Philco part number 31-2724-2) on the 49-906 model radio? I've got a set which I have otherwise fully restored, but I am struggling to find any documentation regarding the capacitance of this trimmer. This is a hollow barrel of metal with a screw that can be driven further into or out of the barrel. Normally the barrel attaches to the body of the air core tuning capacitor (C400), but part of it has broken away. Without this outer barrel being fixed in place, I am noticing that the tuning drifts over time, likely due to thermal expansion of the remaining metal as the radio warms up. For reference, refer to the attached FM alignment chart from the 1948-1949 service manual.

Any suggestions on sizing of a replacement trimmer?