Don`t know if this has any relevance but heres a link to pics i did for NickS G60 conversion.
He wanted to use his PSD G40 pulley but the mounting plate he got from G-laderseit wouldn`t allow it.
Not sure if one is available for the plate.
Basically he wants to be able to use it on both his G40 And G60 chargers incase one was being serviced or whatever.
I took a standard G60 pulley and remove all bit keeping the keyed core.
I parted that into two useable sections as i noted one end of the sleave was a little abused and was tighter on my Dummy shaft than the other
so i gave him two options.
To use his PSD G40 pulley on his G60 charger i needed to remove the back section of the pulley leaving 0.5mm of a face.
The original back part protruded by 14mm so using the tinyest part off blade i could get away with left the parted off bit smaller than original.
On the G60 charger the parted off piece will be a packer/washer for infront instead of the rear.
Then i drilled the two pieces of G60 charger sleave and Thread tapped the G40 pulley so if he needs to put the pulley back as G40 it can be of original size.
I made a Keyway to line up the parts on the dummy shaft from a true sized 6mm Allen Key.
I hope the pics explain
Link below.
http://s1054.photobucket.com/albums/s484/FredG40/Fred.