Firstly I have done a forum search and not found what I am looking for so here goes....There was no spare with my transit minibus so I sourced a wheel and rim the same size from my local car breakers but I do not have any idea as to how the mounting assembly for holding the spare rim under my van works...

The bottom part of this assembly rotates and appears to be spring loaded but I have no figured out how this mechanism drops down to receive the spare wheel..
As per all advice is gratefully received....
TM











