Rennsport Systems Community

So, I was trying to change the oil thermostat. probably is original in 1990 964. Removed the circlip, expecting the spring to push the cap ou,. no luck. Tapped with a punch, to try to loosen. Sprayed with Kroil, then used a small air hammer with a broad face, no luck.
Applied some heat, more Kroil, still no luck. Imagine there is some galvanic corrosion going on. Ordered a new washer/disk for $30.00,
from Germany( none in the U.S.) Plan to drill and tap with a screw and try to pull it out. Out of curiosity,do you know of any other way?
Thanks

Nope, thats the right track.

These can be stubborn after this much time. Patience is your best friend (and sometimes heat).