Homemade measuring tool inner diameter

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tornitore45

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Do not understand how it works.
 

minh-thanh

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tornitore45 !

When I need to measure the bore diameter, I put the tool into the bore and I adjust the bolt 1, the number 2 will come out and come in contact with the cylinder wall, then I take it out and measure it again with my caliper
1.jpg
 

tornitore45

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Got it. Was the spring that threw me off.
 

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