slip....certain poppers don't have full round depth,,,more of a shallow dish.....in other words if the mouth is 1" wide you need like a 1 3/16th bit to get a shallow cup. then there's blue streak poppers that have a deep cup but need to b large because of the dia of the plug itself....so by using 1 1/8-1 3/16-1 1/4 spade bits ground in different round curves, you can match the plugs of old.
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