During the Florida 2001 trip I stopped by Bill's house and he set me up with a 790 driven 
clutch to replace my 500 driven, the 500 is more for top speed and racing, I need a driven 
like the 790 to get my gear ratio back closer to stock since trails and play riding will be what 
the Challenger will be used for if I decide I need more top end I will install the 500 again.

The clutch came in pieces, I cleaned it up and measured the shaft and bushing to see how much wear it had and if the bushing in the movable face needed replaced or not. The shaft measured 1.368 Using a telescope snap gauge I measured the inside diameter of the bushing for wear. After removing the snap gauge you use the micrometer to read the size as shown below, 1.372 Bill and I are pretty sure this 790 driven clutch is the exact same clutch used on the FL350 except the shaft size on the FL250 trans is smaller than the FL350, I used the FL350 service manual to determine the wear specifications, I will call Harold at HRD to confirm these wear numbers, the FL350 service manual indicates a service limit if the fix face shaft 1.367 and the inside diameter of the movable face bushing service limit of 1.378 so going by these numbers I have .001 wear left in the fixed face shaft and .006 wear left in the movable face bushing, I will order a new bushing to have as a spare the next time I order clutch parts. The cam's slippers are worn and will be replaced. Here is a good modification Bill has done to all of his driven clutches, he has a key cut in the shaft so during assembly you can just slide the key in from the end of the shaft and not have to fight the woodruff key. Here is the assembled 500 series clutch sitting on top of the 790, you can see the old woodruff key slot in the shaft.
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