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does your last name start with a 'N'.....think I may know ya.....
M - Live west of fort worth a little ways.
How do you measure one and how do you properly open it if needed?
I would think a pin gage would be the best way to measure. You could probably get by with back side of different drill bits. You could get close with multiple reading with a caliper. I opened mine up by clamping the flat section of barrel in a v-block and squaring off of the lower surface of the upper. I used a center finder to center on the hole. Be carefule a drill bit likes to drill oversize, work you way up slowly. Don't go to deep. I used a mill, if you are careful you could get by with a small drill press. You would get in trouble with a hand drill.
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