Squirt some plus gas penetrating fluid on it overnight then if it is still tight try to tighten it a fraction as this will often break the seal and will then undo.
Cheers
Kevin
Lovejoy 1968 Smoke Grey Traveller (gone to a new home after13 years)
An angled open-ended spanner, either professionally made or heated and hammered to suit. Also the ever faithfuly molegrips will grip the round part of the switch
i always work by the old adage, "if at first you don't succeed use a bigger hammer!"
"The answer to the Ultimate Question... Of Life, the Universe and Everything..." said Deep Thought. "Is..." said Deep Thought, and paused. "Is... Forty-two," said Deep Thought.
My advice for removing the stop switch - which isn't what was being asked asked....Doh!
"I used a deep socket & both extension bars - then it's dead easy. The only thing you need to watch out for is the 3 way union twisting with the stop switch and kinking the brake pipes. I braced the union with a piece of wood against the wing".
Last edited by Chris Morley on Sun Mar 13, 2005 6:32 pm, edited 1 time in total.
A deep socket?
Do you mean to say that you put a large socket over the round part of the switch, and twisted it off?
The actual nut behind the round piece is very akward to gain access to.
Thanks guys.
OK, where do I connect up the vacuum gauge?
I know the copper pipe comes from the carb to the vacuum advance. Do I have to cut into this?
Cheers.
Vacuum guage needs a separate take-off from the manifold. The guage should come with a threaded adapter. Remove the manifold, drill correct sized hole (in inlet, NOT exhaust!) and tap to suit the adapter.
Websites: 
The only thing you need to watch out for is the 3 way union twisting with the stop switch and kinking the brake pipes. I braced the union with a piece of wood against the wing".
