This is just a tapered thumb it is not hard to do. if you have an oval thumb you make your oval cuts, then divide inhalf your cuts so you are centered over the hole, then measure with your bt ball fitter the very base of the thumb around the knuckle. use that drill bit size, then go two bits smaller each time until you get to your original size. each time you go about 1/16 down. once you are done, just use your bevel sander and the cuts will be sanded away. this way you never have to touch a bevel knife.
this is useful for people with thumbs that get hung up on the front side of the knuckle. you can push the thumb in as far as you want to and it will not have any pressure on the top each of the thumb. occasionally if the the taper is too far down or too large you might experience pain in the muslce tissue just below the thumb.
if a person tries this and finds they loose the ball it is because they have a tendance to hold on to the ball with the base of there thumb.
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Timothy @Juniors Pro-Shop
Staff Writer 7-10 Split Magazine,EGO Communications
Montreal, Quebec.