To change the pinchroller, simply remove the "C" washer/clip using needlenose pliers, push the pin out, replace with new roller, and re-attach the clip. Make sure the dot is on the outside, as the rollers are coned. Also don't replace the outer rollers with the removable rollers, they are not the same.
@Artbot...the pinchrollers will wear out over time, and will skew the media. Ink on the rollers will shorten the life of the rollers as well.
My .02
GTSTech_1