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I use aluminum bar stock the same size as the insert and an aluminum block. Heat the insert from underneath with a heat gun on high until VERY warm. Hold the block firmly on top of the insert and push up/wiggle/twist from below with the bar stock. Works great. In fact I am thinking of producing kits with various sizes and the block. PM me if interested.
Quoted from vid1900:But doesn't it just sag again in a year or so?
I have never been able to simply mold them flat again and have them stay flat.
The auto clear reinforces them.
I don't know yet, just started this a month or so ago. What do yo mean "sag?" The inserts I am doing are cupped due to years of ball wear. They are not actually "sagging."
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Greenville, OH