Subject: Re: Quarter Light Catch
David,
I think that I have the same quarter light catches on my V12 saloon.
The bit that is missing is the tab which you press down on, against a spring, to release the catch from the grooved peg in the frame.
I have taken a selection of pictures that show how it operates - picture 136 shows the locked position and 137 shows it opened by my finger pressing on the top tab. Pic 135 shows it from the rear and reveals where the spring fits in.
If you would like me to take one off and dismantle it for more detailed photographs of the components you only have to ask. It will of course cost you a pint of beer the next time we meet!
regards
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