if you know a machinist he can whip them up pretty easy. All you need is a grinder. I have been doing mine like that since I started but I made mine in several sizes and the pilot part has no flutes just a ground 5/32 dia. which follows my thru hole. Works great and i sometimes only use a hand drill. I can't imagine doing it any other way. Pretty sure Mike has them made for the belly hole and the counter bore ground onto them for grommet seating, same idea would be used for tail weight. If you ground down the drill to 5/32 pilot there would not be any flutes left so it would just be a dia.
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