I had the old Hot Cams and had to do the same thing.Put cam in freezer and heated up flange. I bought a new cam gear flange and jacked up my truck and lowered it on my cam to press it on(ghetto press). Its been 4 years and the cam is perfect.
2000 400ex 11:1 Wiseco,stage 2 Hotcam, WB R4 full exhaust,WB rev box, K&N/OW, 450r carb, no lid, +2 a-arms,Works shocks,GForce axle,chrome stem,fat bars,250r hood, brake blockoff, ASV clutch lever, race cut fender.
2003 Cr250 White plastics, V Force 3 reed cage.