When I bought my ignition switch, I got the one with the lock set. My plan was to drill through the F-01470-L Fuselage Side Skin similar to what other folks do. But, I eventually balked at that as there is a definite...finality...to that approach that I couldn't stomach.
Instead, I thought I could fit a padlock through the C-609 Canopy Latch and C-607 Latch Handle. Below gives an idea of the available dimensions for the purpose.
Center-to-center, at the outboard edges of the Canopy Latch and Latch Handle, the two parts are 3/4" apart. So I needed a lock with the same center-to-center shackle width. The Master 4130 fit the bill. Dimensions are A:3/16", B:9/16", C:9/16" with a width of 9/8", which gives that 3/4" center-to-center spacing I needed. Although the shackle diameter is larger than I wanted, it will work.
A #11 (0.191") hole was drilled into the C-106 part and a 7/32" (0.219") hole was drilled into the C-107 part. One hole has to be larger to accommodate the curvature of the shackle during insertion.
The lock then fits in very snug. It cannot move even on a windy day.
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