1971 vendo vf-90b-need help

The machine will vend perfectly, but the bottle mechanism will not reset once the bottle is pulled out.  I know very little about these machines.  I believe it is a selonoid issue - any idea where I can purchase a service manual or wiring description - I believe that it is missing a piece-just don't know what it is or where it goes...

Any ideas or help would be greaty appreciated

[dr galaga]

I had a vending problem with my 63.  This may help:
http://soda-machines.com/cgi-loc....;t=1440

I got my manual from ColaMachines.com.  It is a download and they were fast.  I think it's a little cheaper if you get if from ebay:
http://cgi.ebay.com/ws....me=WDVW