Just thought I'd post an update on how things are proceeding.. Still got lots to do, but I can now see light at end of tunnel!! 
Exactly what I wanted to ask too..
Is that an "Alton" rectifier for an alternator,
Or a solid-state regulator for a dynamo?...
A very nice bike!
I know a guy, which restored a WM20, but not in a military outfit. he did it red.
The guy polished the engine, the carb, painted it in deep red, and it really in a showroom condition.
The problem is that he liked so much the way it came, that he did not ever
Fill any fluids in it, or ever got it started.
I hope you would !
Noam.
email (option): noam10@gmail.com
It is indeed a reg/rec for the Alton I've fitted Keith and Noam.. I will be riding this bike too Noam when finished. I hope to possibly ride it to the BSAOC International in Denmark next year..
Noam.
email (option): noam10@gmail.com
Outstanding restoration...! I believe that brown box at the rear mudguard is a miniature Fletcher's dumpster...
email (option): bobdukw@aol.com
That's coming together nicely Ian
email (option): horror@blueyonder.co.uk
Many thanks Gentlemen for your comments. . And yes Sam, it is fitted with the MT110 you sold me..
Sam. Mine is fitted to the WD/G that I am currently preparing. The bike came with an original MT110 base that was fitted with a repro lens cap. Now all is as it should be.
Ron
email (option): ronpier@talk21.com
Love it...Could we be 'on' for a 100 M20s on the 75th. Anniversary of 'D Day'..
....Ian
email (option): ian@wright52.plus.com
Thanks Geoffrey.. Girder M33 a rare beast!! Try these links which I hope help you..
http://www.draganfly.co.uk/index.php/bsa/bsa/a710--b3133--c101112--m202133/category/920-8-qd-rear-3-bolt-fixing-1938-48-m
http://www.draganfly.co.uk/index.php/bsa/bsa/a710--b3133--c101112--m202133/category/914-2-girder-front-1938-47-m-group