I just got GoatBoy's drilling bracket.
Preped 6 cars for Saturday local BSA races.
All 6 cars were within 100th Second.
With that bracket, I didn't use the Silver Bullet (IMC, it was the J's Block)
Don't know how many more he may make, but with the protective inserts, it's the real deal. Don't get sucked in by a copy cat. With out those inserts, the holes elongate after perhaps the 10th car. I have an old one to prove it.