Hi, folks! Based on all the feedback I've gotten from lurking in this sub-forum, I bit the bullet and bought a tire changer. My dealer quoting me $200+ in labor for tires purchased elsewhere or paying MSRP for them didn't hurt. I found a used Wikco changer on Craigslist, set it up and used it for the first time this weekend. The removal went smooth as silk. Bead breaker and demount bar both worked perfectly. The problem came when I tried to mount. Using the mount bar, I could get the tire about 70% mounted when the wheel would start to slip and rotate. I cranked the clamp down as tight as I felt comfortable (pretty dad gum tight) and it still slipped. Ended up using spoons to finish the mount, which worked OK. I'd just rather not have a large contraption taking up space if I'm going to end up using spoons. Full disclosure- I used gaffer's tape on the rim clamps. Is that what's causing the slipping? Am I doing something wrong? Thanks!