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I'll weigh in... I tried to rebuild both disa valves and ended up buying OEM in the end. I started trying to use epoxy to reseal, but after a drive around the block, the oil inside the disa valve (necessary to the proper function of the motor) crept into the seam and the back of the valve fell off. Attempt 2, I ordered formic acid and tried again with a second set of salvage valves and the rebuild kit. I cleaned meticulously, used clamps, waited overnight, etc. They still wouldn't stay closed for more than a couple days of aggressive driving.
My two cents is just suck it up and buy the OEM units from FCP euro. Return them for free replacements after 50k miles. The peace of mind that these valves are permanently welded shut is worth it to me after these two failed attempts.
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