Yes they can be repaired. I just finished mine. Took several tries but here is solution. Read the rest of the thread first to see how the closer is taken apart. I tried several thick Silicone greases but here is the one that DOES WORK ACE Brand #4095667 Silicone Grease 90% Pure. Warning this stuff is very sticky and gooey. After cleaning old grease out (not necessary if this is your first time), put a SMALL amount on top of each cylinder and go do something for 10 -15 minutes (it wakes awhile to flow down), when it is all settled down add some more, do this until it is almost up to the top of the cylinders. When this is complete reassemble everything and WALLA a seat that works as good as new.