Here's how I did it on my Rapide - and it still works OK 20 years on !!
http://i722.photobucket.com/albums/ww224/jazshadow/tev140hever20042.jpg
http://i722.photobucket.com/albums/ww224/jazshadow/RearStandLock2.jpg
http://i722.photobucket.com/albums/ww224/jazshadow/RearStandLock1.jpg
http://i722.photobucket.com/albums/ww224/jazshadow/RearStandLock3.jpg
Cheers, Brian
Wonderful solution, simple, unobtrusive and "relatively" effective. I thought you'd sent the wrong photo, couldn't see the lock until I opened the drawings and realised what you'd done.
Have to admit, I'd never thought of locking the stand down, but it's now on my list of projects.
H