Guys, I think you are making this way too complicated. The process is simple; replace all o-rings (there is no thread sealant) that you can easily get to. If you are doing a conversion you need to replace drier/receiver (cheap and easy to replace). Button it all up and take to shop to flush the system and vacuum for an hour or so. Refill with 134a and you should be in good shape. This is not rocket science. I just did this to my 380SL and it blows nice, cold air. You can get 0-ring packet at any auto parts store. You may want to check out this site: http://www.id-usa.com