Comment
Henk the filler neck is about 1 3/4" diam with bayonet type cap. Here is mine with breather valve and oil measure tube.
Ron
email (option): ronpier@talk21.com
I wonder if it's the same size as the 50's Triumph bayonet type oil tank cap..Ian
email (option): ian@wright52.plus.com
Ian Wright
I wonder if it's the same size as the 50's Triumph bayonet type oil tank cap..Ian
They're all about the same, but don't have the knurled vent hole valve in the top! Ron's replica from Metal Magic has!!
Henk, if he buys an original from me, maybe he will sell you this one??Lex
email (option): welbike@welbike.net
I have to send it to India so I have to make sure it's a perfect one 
email (option): ahum@quicknet.nl
Henk WM21 2415
I have to send it to India so I have to make sure it's a perfect one 
Yes, that might do the trick! making a replica of a replica, and then the result will be 100% perfect!!
Ron, I'll have a look what I've got left, your Flea deserves an original one!!
Lex
email (option): welbike@welbike.net
OK so that's two
Ron
email (option): ronpier@talk21.com