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A cheap alternative to a duplicator is a set of calipers. Take real good measurements of a plug that works the way you want. After you round out the square stock, mark the reference lines on the blank and refer back to you measurement paper to how deep you need to cut. Check often with the calipers to get you to that depth. Will not be as acurate or quick as a duplicator, but you can get them real close.
Jigman
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