I have flown one RV-12 with bad throttle creep, and it was really annoying. Mine hasn't had that problem. The McFarlane site has replacement packing for the friction lock. The absolute best solution, though, was to install the vernier assist throttle cable assembly. It wasn't difficult or too time consuming to install, and although it's pricey I have to say it's been worth the money and effort.
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid