Symmons shower faucett leaking - trouble getting valve out
I have a Symmons temptrol shower faucette that is leaking. I did an internet search, and found this video that talked about replacing the spindle. http://www.youtube.com/watch?v=HBC_Qhw10aQ
My shower assembly looks exactly the same as in the video. I got to the part of the video that it is at 1:10 in. Removing the spindle. It was very difficult to start to remove. I finally got it to budge, and thought I was going to be home free. However, it never got easier. Now, it has a whole half turn that it will go easily either way, but is not any easier to come off. It seems like something is wrong to me. It looks like there is a black washer along the thread that it is turning on that might be binding on? Should I just continue struggling with it until I eventually get it off? I just don't want to ruin anything. Something doesn't seem right. Thanks for any advice anyone can provide.