Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Update:  I've also had problems crop up with the needle valve leaking butane
when open.  A woomph and a cloud of flame.  Tried a couple strategies but the
only one to work was requesting a few new O-rings.  I received three and
a new needle-valve (w/O-ring).  Popped the new one in and it was all good.
I measure the O-ring at 4.5mm in diameter with an inner hole of perhaps 2.5mm
with a wall thickness of about 1mm.  I suggested to the maker that two O-rings
on the needle valve would be a good idea.  Extra O-rings for every buyer would
be good for a start.

Wayne