The most economical way is to use a axle of the same size. For instance for DD4H 92's which measure 91 at the tip, I use a retired 91 to relieve the hole . You can cut the head off and insert in a pinvise and work it in and out. You can purchace a proper size reamer. Or you can purchase a gauge pin of the proper size. But the cheapest way is the first option.
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