Hello Harry,
Here is a print of the toggle lock mechanism you asked about.
The print is from Fred A. Datig's book, Monograph IV : The Swiss Variations, and also from Vitorrio Bobba's book on Swiss Parabellums.
Hope this is helpful...
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />