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Matt I use a 1" steb center primarily. Remember when you use the squares the 1" is fine. I have a 1/2" for dowels (needles). A cupped live center helps prevent wood splitting and have a secure holding pressure on wood. Live center in a steb center are available also @ Penn state. Thats where I buy all my accessories for the Jet, Drill chuck, drive centers, steb centers etc. Occasssionally I use the 4 prong for a better bite on a larger and harder peice of wood. How I prepare the spur is to mark your center, prick punch center hole w/awl then drive the 4 prong spur w/ a hammer to get a good insertion into the wood. Remove 4 prong drive , reset in lathe mount piece into the grooves. This is how all my baseball bat billets are mounted on the big Jet. Never had a fly off or spin out. You surely don't want a fly off with a 5lb 37"X 2 3/4" billet.
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