I thought I was going to need new pedals for my PowerGrips, too (I just bought the strips to attach to my own pedals), so I asked at a couple of LBS's whether I'd be able to install the pedals myself. At each shop, I was told that you have to be very careful about threading the pedals. I also read this in a bike maintenance manual I was looking at over the weekend. If you do it yourself on this job, you may want to get very specific instructions.