Matches, clips, needles, or pins.

J Prosthet Dent. 

1975 Oct;34(4):467-72.

Balshi TJMingledorff EB.

Abstract
Several methods for positioning dowel pins used in the fabrication of removable dies have been presented. Needles, pins, paper clips, hairpins, andmatches are all useful in positioning dowel pins in the impression. The use of paper matches is a simple and effective method for holding the dowel pin in the proper relation while the die stone portion of the cast is being poured.

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