I have two ford 4000 tractors with the sos transmission. The first has a marginal #1 band and the second "donor" has all three bad bands. Has anyone tried resurfacing the bands? What is the material and original thickness? I think its a carbon metalic by looks but I have no idea on the original thickness. I am thinking on trying, but if it failes could be expensive. SOS parts are getting rare. I have both tractor split and have good bearings and clutch packs just need bands.