Here are some photos of my latest CNCed mount to suit the V4. I have been using this setup for the past 4 years with great success and 100% reliability 850+ flights. I recently had my drive serviced and was told it was all good with little to no wear. The bearings in the motor needed replacing however all the bearings in the drive were still good to use. I had them replaced anyway given I sent it in for servicing.

I am building a couple of new models for the season which gave me the opportunity to think about the mount a little further. I wanted the ability to remove the entire motor and drive (without disassembly) through the front of the model. To remove the whole drive I simply remove the spinner cones which will give me access to the front bolts. I then remove the 2 bolts on the rear brace to the fuse, rotate the drive slightly and extract the whole assembly.

I don't have weights yet as my scales no longer work but it's minimal for the added complexity. The benefit is the whole drive floats and the rear shaft support is isolated to the rear cross brace/fuselage. This setup goes a long way to removing the axial loads at the rear of the motor shaft especially under high G maneuvers. The model is also noticeably quieter to other V4 drives I have heard.

The large front carbon ring shown in the photos will be glued permanently into the model as the drive mount

I have to give acknowledgment to Henning for coming up with the concept and Richard Hirst for drawing it up for me.