That's great ruSTynutz. I used a similar concept for the heated grip controller on my ST, and also for the CB radio mount on my current Beemer. I turned up a couple of short cylindrical spacers to go between the new plate and the handgrip casting and then used some slightly longer cup head (allen key) screws to hold it all in place.
Thanks Pete...I actually got the idea from the bracket used on my heated grip controller!
I'm not sure if the bracket came with the grips or if the previous owner fabricated it but it inspired me to use a similar design.
I was going to use aluminium for the main bracket but thought it may not be strong enough unless I went for something probably twice as thick as the stainless steel. In hindsight it would certainly have been much easier to work!
I too needed some cylindrical spaces but I cheated, I just used some appropriate sized aluminium tubing and cut some from that...
I used slightly longer bolts as well...Luckily I had a jar of assorted bolts etc I'd purchased years ago from a motorcycle wrecking yard.
Making the bracket was actually more complicated than it looks as the tpms was designed to be mounted on the handlebar so had part of the mount on the back along with the charging point. I had to cut an appropriately shaped hole so the tpms sat flush on the bracket.
Cheers