Momo handbrake handle - Help!

[D2BBA]

Looking for some help from anyone who has fitted a momo handbrake handle to their FD.  

I spend a few mins last night cutting away the old leather look cover and rubber to expose the actual RX handbrake handle.  The new momo cover should then just fit over, however it wobbles about a hell of alot, the grub screws dont tighten down enough and the handbrake release button seems to foul the top of the cover!

Any advice out there peeps?

Cheers in advance
Chris