Why not do it electronically rather than mechanically?  Mount a small value variable capacitor on the main capacitor to keep stray inductance from the leads down, and tune it thru an extension, either plastic or an insulated cable type.  Simply put a collar on the front panel to run a shaft through and put a knob on it.  Start your tuning with it in the middle so you can vary it equally either way to walk your frequency right to where you want it.  This of course assumes you have waited the appropriate amount of time so the internal heat has stabilized and is not a factor.  And it assumes your generator is not drifty due to other factors.  My .02.  
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