Just buy a new one and be done with it. There is no cheap fix. O-rings didn't work for me either.

I bought mine for $180.00 from europartsdirect. They were the cheapest, but I should have called Phil (from Fastlane, this site, link above) and inquired as to whether he would match that price. I suggest you do so.

After replacement, check mixture, and enjoy your car, fume free.

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E