Hi, I'm looking for some wisdom here!!!

I recently got my hands on this little lot - http://www.l-camera-forum.com/leica-...a-job-lot.html

So far I've still got it all, but thats another story......

Having started to work my way through getting bits and pieces CLA'd my attention has finally gotten round to the Leicaflex SL.

The camera appears to function well although I need to get a battery to test the meter. One thing that isn't right (unless I miss something obvious) is the following.

The mirror remains in the up position, I need to lock it down manually, it does not return when cocking the shutter??

Help greatly appreciated.