JoG, I'm just messing with everybody about the "special screws" we all have buckets of them in the shop. They are special because you always have one less that what the job needs or you can't remember what they came off of. I ordered up a Raptor petc0ck along with a new gasket and will slap it on when it arrives.
OF how often do you pull the tank and petc0ck. I'm lucky to yank the tank once a year. Regular maintance for me means checking tire pressure and the oil level, can't say that I have ever seen the filter on the petc0ck.
  Now since the tank is off should I keep going and install the stage one cam that has been sitting on my desk forabout a year