I have two Enya 35's. I also had a muffler/weight problem
It was solved by Leonard Neumann over at Stuka Stunt Works.
I bought one of his strap-on Tongue mufflers . Great quality , service and a very polite gentleman ! End of plug !
Get in touch with Leonard , he'll sort you out. My Enyas run just fine on these Tongue mufflers.
Hope this helps ,
Robin [ ex-pat Brit in the Charente full of ex-pat Brits ]