Aircooled VW South Africa

Ok here's my quest,.....my friend who is a f-word fan bought this car,....lots of niggly issues being resolved. But.....I am in need of someone with knowledge of the overdrive system,....mainly the engaging and disengaging,.....something on the car just does not seem right,....and Mrs Google is not very helpful.
1. There is no engaging lever?
2. There are 2 solinoids on the box,...biggish one on the right,..which I think is supposed to disengage,....and then on the left a smaller solinoid,....some wiring connects the two
And thats abrout it
Cann anybody shed sdfome light on this



Regards Haans

All,....solonoids bigger rh side,.....smaller lf side ,..not directly opposite each other




Box still in the car,....trying to get an understanding of the workings before removing it .
Leverage system is not in the car at all. Some sort of "switch" on thesteering column.
Haans