I'm in the middle of converting my non-working R-12 A/c to R-134a. I have the evaporator box apart and was about to gut the TSV (throttle suction valve) as that seems to be the thing to do when converting. I've read a few threads on what to do but, all of the threads either don't have pictures or they are so old that the pictures don't show up. My question is, beside the 3 items (metal clip, plunger, and spring) is there anything else to remove to complete this procedure??