I ordered 2 sets of Crest Rollers. This setup differs from others posted but it works for me. Measuring from left to right, the spacing is:
0", 2-11/16"-Power, 6-5/8", 9", 12-7/8"-Power, 15-13/16", 20-1/4" and 24-1/2"
The reason is the smoke in this new engine smells very waxy, I have MegaSteam Eliminator coming to flush it out but Momma says "out of the house" this will allow me to run the engine on the patio table.
Eddie
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Eddie, those rollers came in handy troubleshooting one of those myself a few years back.
It kept stalling at low speed and eating traction tires. I even sent it in for factory repair, it came back better but eventually was bad again.
Turns out it needed a new DC motor on one truck. Once that was replaced all has been good for many years.
I have three sets of rollers, they get used almost every day on the bench. Very handy little tools. 
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