take it to a Bike Shop just to take out that 1 bolt they should do it while you wait? Or get some penatrating lube and let it sit a while then buy a stronger allen wrench.
Hey... Me too. I think they squirt Glue on them to keep them from Backing out... Then some Chinese kid Whacks it with a hammer to freeze it to the shaft. I tried a torch to get things moving and that didn't do it either. (Always worked with Tractor Parts!?!?!?)
I was in the same situation not long ago, one of the arms WAS NOT coming off without of fight. Some wd-40 works well as a penetrator and yes, putting some heat on things will help break them loose also. Allen = T-handle. Hammer = ancient chinese secret. Glue = ********. I guess you could jb-weld it to hold, but don't expect wd, a torch or the fat chick next door to break it loose.