I have been told twice that this model were known to catch fire in certain circumstances & B.S.A quietly retrofitted the gauzes .
I believe the ones on Trevs bike are the original ?
I contacted Burlems & they have none left so I am scratching My head ?
I have the original bellmouths although the gauzes are long gone , still searching .
Thanks for the responses & I hope highlighting this point helps Someone else ?
I cant think of a way to make a swaged piece to fit around the outside edge of the bellmouth which would hold the gauze ?
I am open to any suggestion or offer ?
Steve ..