Hi Danny,
I got a set of needle point diamond files, ground the end off one so it wouldn't drill out through the plastic at the bottom of the seat and I put the file in a battery drill and give the inner seat edge a quick file. We worked out some time ago that there must have been a machining burr on the edge of the seat that was catching on the nitrile tip and causing the needle to stick in the seat. Once we started removing the burr the sticking problem went away so we didn't need to use the little clip. After I file the burr I then give the seat a polish with Autosol on a cotton bud in the battery drill
