I'm hoping someone can help me. I have an old cr-630 that still works but was cutting poorly. I looked at the assy and found that not only was the blade holder assembly broken but so was the carriage rollers (wheels..whatever you want to call them). I was able to get a new carriage assembly but can't figure out how to get the carriage back on the track, It came off easy enough but it was broken and made out of plastic. I don't want to bend the tracks but I can't get it on. I also looked on YouTube and the only video I found says to spread the rollers but I still can't get it on the track. just wondering what I am doing wrong.