Is the shaft that comes out of the damper round where the linkage arm bolt round, or is it machined with a "flat" spot? If it has a complete round shaft, then the damper is "old style" shaft and wiper which is located inside the damper. The shaft that is round then machined flat area is the newer style model. The wiper is made of nylon material, and can wear down cause the damper to not work properly, less damping action.WER can rebuild the "old style" and install the updated shaft and wiper for about $100.00, which is labor and all parts. There is NO moving parts except the shaft and wiper in the WER dampers, so nothing to wear out excpet for the wiper.
My WER was getting to the point that it was doing nothing but taking up space under the headlight. I changed the oil, and bleed the unit, but still acted lile it was not working. I even went as far as putting in 80wt to see if that would work, nothing. The wiper was shot, flat worn out. Trying to bled the air out is a pain, best to let WER do it to ensure all the air is out of the unit. If you sent the unit to WER, send the mounting plate also.