I need a new o-ring for the high speed needle and ofna has not responded to my e-mails. does antone know a part # or a size that I can get anywhere. also I killed my pullstarter and bought the ofna .21 replacement from towerhobbies. it works most of the time but it is not the right one. does anyone the right one and where to get it? also if anyone needs to replace it, do not buy the one that towerhobbies sells as a replacement for .21 engines it will not work