Hello everyone I am new here and I am getting back into control line after flying RC exclusively for years. I have two old Top Flite P 47 thunderbolt kits that I am building, the ones with the preformed balsa fuselage shells, one was given to me years ago but it was missing the plans so I found one on ebay recently that was complete and when I opened it up there was a brand new pristine McCoy 19 in the box that had never been run spotless condition no varnish or fuel stains or anything on it and the compression is outstanding. Problem is that the needle valve is missing, the venture is complete but there is no needle valve, I have been looking around on the internet for NOS or reproductions but I haven't found any. Can anyone help? Are these valuable when they are in unused condition? Should I keep it that way or should I use it?