Hi John.....
....the problem is that there's a small tab left that keeps the switch body from turning. You drill a smaller hole than you need intially, the edge of which just touches the inner end of the tab. You then overlay the backing plate of the switch and trace the opening and finish filing either side of the tab to dimension, so I can't give you a hole size.
Regards,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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