I took one arm off to see the clearance issue with the cone in position, and I believe the flatheads are a must, but flat heads have a tapered head so I think I will have to countersink the bracket to let them sit flush with the bracket and then the cone will just squeak in. I'm not sure if Fastboy did this or not, may be he could chime in, but in any case I will do this in the shop tommorrow regardless. I'm glad I bought a used set instead of new, I would have had a little heartburn drillin on a new set of arms, I dont have any pegs yet, tryin to get a cheap set on E-bay as well, but I'm a little concerned about how much adjustment these things really have, If I dont like my foot placement they may just go back on the auction block.