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Mike: I have taken those apart for repair. You have to drill out the two brass rivets in the top mounting plate. Then you can separate the two halves, and see what's going on. There is wire wound resistor (some very fine 30 ga.? maybe) nichrome type steel wire. Resistance is 0-30 ohms across the movement. The bushings are brass with a small copper wiper arm. So if it's that frozen up, there is likely a real problem in there. You will have to find some rivet's to use to reassemble. Now the bad news, if that wire resistor has been overheated, it's probably broken, and I haven't been able to solder them. Since it's steel wire, it really needs to welded, and I don't know how you would go about that. I got some wire from a specialty wire house and rewound my own. They are no longer available from Deere, but Nick Barbieri does offer original units as well as a universal unit that will work. His number is 516-221-4116 if you would like to contact him. Frank-in-Tallahassee
70D // 855
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