Actually, we've had much better results using the blue moose method. But we use a light cured wax for the clasp and arm, then we cast that with an old NP button, then we super glue it to the adjacent tooth or gingival area. While I always like having the partial in hand so I can tweak the clasp in needed, I've found that even when the doctor does the pickup impression with the partial in place, there is always some form of variance, and the doctor usually has some adjustment to do intra orally.
Craig
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