Speak to Dan Sims there - he developed it. They had it on test for many months in their demo car with all the engine upgrades on. I've had one fitted to my MMC stage 3 engined car and no issues at all and also done 1 circuit race and a sprint so far with no problems.It basically a steel shaft and a BMW rubber donut in the assembly.

1928 Superaero Jap 3 wheeler
2013 5 speeder 3 wheeler