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#3
September 13th 06, 06:51 PM
posted to rec.aviation.homebuilt
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instrument sizes
A big 2 5/16" (58mm) hole, and four small #18 (0.1695, just a shade smaller than 11/64") screw holes with centers spaced 2 5/8" (67mm) apart (ie, the little hole centers are 1 5/16" from the center of the big hole). For comparison, the equivalent numbers on the next diagram for 3 1/8 instruments are 3 1/8" and 3 1/2" respectively. Thanks for the quick reply! When you say #18 screw holes I ssume you mean #18 drill. Are the screw threads 6-32? 4-40? PS- Not trying to talk down to you in my description either  Not at all. I appreciate the clarity. 
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