My "worm" repaired rear PR4GT was still loosing pressure, so I made some enquiries about getting it professionally patched with a mushroom plug from the inside. All three dealers that I rang would not install a patch, as it was against tyre manufacturer's recommendation due to the speed and load under which they operate. Each offered to either fit a tube, which I was not prepared to do as another puncture would give me a rapid and potentially catastrophic rapid deflation, or take the tyre from the rim and let me negotiate a patch/repair with a nearby car tyre dealer.
Since the tyre had 10,500km on it, which is around half of the life I would normally get, and it was going to cost me to get it fixed no matter what option I took, I've replaced it with a new PR4GT for $285 fitted and balanced.
I'm happy to have a new tyre, but annoyed to loose 10,000km of life from my old one. I've ordered a "Stop N Go" puncture repair kit, which looks like it gives the most positive repair to a simple puncture in the tread.