I thought I lost it many years ago, but in cleaning out my garage, fallen behind a workbench, I found a MEGA / KHM .21 new, inbox, never been started, with booklet, serial sheet and case I.d. by Klaus Hienz Meier. I remember purchasing 4 of these engines back in the VETEQ days and all this time it was behind my workbench, should I keep it as vintage?, or put it up for sale?