I just started using the Vise IT system in my pro shop, and I also have the Vise molded thumb kit. The Vise IT system is designed to use Vise thumb slugs, not molded slugs. I think that I could use a molded thumb slug, and install the male and female mollies into the molded slug (with a little machine work). Definitely not worth the time unless it was a specific situation that required it.
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Gary Palma
X-act Reaction pro shop at Ideal Lanes
PBA Member
2008 Hammer Staff Member