Just to clarify the recent thread as regards the availabilty of this type of switch.....Here is what it looks like:
Here is where you can buy one and others available on Ebay too:
Les
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early-stop-light-switch-jpg
The single tube frame obvi…
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There are a variety of gen…
There are a variety of generic & non-standard brake light switches that can be made to work effectively.
If you want the factory correct switch, let me know what year & model single downtube bike you have & I am happy to look it up in the original Lucas books.
Some info from Lucas:
For all Norton twins & singles 1949-1956 the correct switch is the Lucas Model 22B, part number 31437B
If you have a 1957 model 77, the correct switch is a Lucas Model 22B, part number 31437B.
If you have a 1957 Model50,ES2,19- use the Lucas Model 22B,part number 31383B
For 1958 Nortons:
Singles (exept 30 & 40 inter) 31383
30 & 40 inter 31437
twins : 31383
Nomad: 31383
31383:
31437
These 2 versions of the Lucas 22B appear identical, but if you look closely, assuming the electrical connectors at the bottom, one switch pulls to the right, one pulls to the left. The 31347 (lower pic) is very common on Triumphs. If you are very careful, you can disassemble these & reverse them, but be careful of the spring flying out !!!!
On the original Lucas switch, you will find the part number stampped onto the top of the silver slide at the wide end
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The single tube frame obviously had a different switch altogether and it's certainly not the switch fitted to the Featherbed Dominators as was implied in another thread..