A real head scratcher !!

[tree98]

2007 kenworth t800 4 axle log truck. I was putting new brake shoes on the forward drive axle and on the passenger side I can't get the drum to slide over the shoes!! It's not the shoes because I tried a different set, same problem. It's not the drum. It looked like the spider or the s-cam bracket was bent and was holding the shoes open just enough for the drum not to go on. SO I replaced the spider and s-cam bracket. As of now it has new spider new s-cam bracket new shoes, new hardware, and the drum will NOT go on!! The only thing left that could be bent is the flange on the axle tube that the spider bolts to. But how could that be bent and nothing else is? I'm totally stumped here. I'm gonna have to have the rollers turned smaller on a lathe until I can figure this out.