Daver, woops, that's what I call my son, he's Dave also. I am a recovering "castorholic" I have gone through 3 gallons of WildCat 10% fuel they call 2/4 with 18% full synthetic. I have been monitoring my engines, (mostly Saitos), regularly by pulling the backplates now and then. Some of the rear bearings were stained from castor use, they are now shiny and clean. My Fox .25 with a meehanite piston quite literally howls on it with a Taipan 10x6.