Alan,
I am a little confused by the first picture are you saying you need another one of the screw on shaft shown ? Is it broken ? can't you use the exisitng part as a template ?
I have several Tongxin motors including a non working one for spares, which I am happy to strip down that part and send to you if you need it ?
See this
here for my Tongxin strip down. The pictures near the bottom of the linked page show that part and how I had to cut it down.
That part comes in different lengths, especially if like me you have the Tongxin model that I ordered in error that is made for a roller brake fitting. I had to cut mine down as shown in your first german pedelec picture to make the fold on my Bromtpon tighter. Its all in my link if you have a look.
Ps just re-read your posts. Those holes are in the case cover and secure it to the internal clutch plate. The screws are not that long or substantial and I am not sure they will be sufficient to take the load of those rings ? Again don't you have the original to take the measurements off ?
Ah another look and just to say that the hole spacing/fixings on the main shaft does not match the hole spacing on the cover plate. Look again at my strip down post and you will see the internals.
It may work but as you can see above those screws on the cover plate attach and secure to that internal clutch ring not the fixing at the base of the shaft.
Regards
Jerry
