A thin, flexible, sturdy piece of plastic is all you really need. Cut up a plastic milk jug and soften/round the edges and go to town. Insert it far enough to penetrate the width of the seal and go around the tube. Bounce the front end a few times and repeat once or twice more.
Of course, I found out about this stupid-easy fix after I paid for a complete seal replacement.
He has a 09 I would think it's seal replacement time if they haven't been done already. Esspecially if the fluid/oil hasn't been changed regularly. Seal mates are great in a pinch or on the road but it's usually not a long term fix unless its just fluke. But what do I know?
Got the SealMate on Friday and today I had time to work on it. So far so good. The hose clips were a pain and I got the two rear ones off without breaking or cutting them, but the forward one (right side) there is no way to get in there even with the long needle-nose plyers I have, so I cut it.
I will report back after a few rides (didn't feel like riding it other than around the block today).
I also mounted the light mounting brackets from n3nman on the other forum mounted. Need to get some good hook-up wire and shorter bolts before I can mount the lights onto them, but they went on easy.
You might need 2 or 3 "treatments" with the SealMates in some cases. So don't give up after one try if the leak continues.