WD brass bezels are secured by a "Smiths" embossed rivet...........this needs to be drilled-out.......
As for unscrewing the brass bezel, some are easy but others not, especially when gummed-up with paint, etc..............
Safest method is the old leather strap wrench with big leverage.............otherwise you risk damaging and/or destroying the soft-brass bezel and the equally thin steel speedo case...........
Put some resin in the hole to prevent slipping and over-tightening...
here another tool:
Re. my earlier post on speedo's, the nuts holding the speedo are certainly not 1/4"BSF/BSC, and also not 0BA (as I stated before), but common M6! the little big headed screws holding the internals are M5.
But now the catch, if you want something original looking, the M6 nuts have an outside diameter of 10.5mm (AF) (and not 9,5mm as on normal M6 nuts), and are also higher, just had a small batch made;
The thread on the bezel is also metric btw. and the reason for all this is that when Smiths took over the French company/patents of Jaeger, everything was ofcourse metric!
Hope this helps,
Lex
email (option): welbike@welbiXX.net (think about this!)