Good morning gentlemen from Spofforth village in North Yorkshire , England.
Two choices it would seem.
Send your G51 to Randy , or to Tom Dixon.
Years ago , I sent my G51 to Mr Dixon. It purported to be the ‘CL’ version. It ‘ran away’ at every opportunity.
It came back transformed . My best engine.
Set up with a 12x5 Graupner prop’ it purrs. Like a Tiger ?