Now I do my own servicing, I may try cutting up some plastic 2 litre milk bottles into strips of tough polyurethane plastic and use them as protective shimming under the belt whilst I tease it onto the pulleys, or maybe cut up an old thin Ikea plastic kitchen cutting board. I may also try putting the belt in a warm oven first to allow the rubber to become more pliable before fitting.
Good luck!
Seriously. I tried (only to see how easy it was) and it is a very painful process. If you end up with just one written-off cut belt (as Whatton found on his much easier to change 1150) you are not far short of half-way to the cost of the 'wonder tool'.
Not least, you may be left wondering how you are going to ride your bike the X number of miles, to buy a second - or third - replacement belt.....
Sod's Law says you are not going to have an oven around when the damned thing breaks anyway.....
This bloke's report is pretty accurate:
http://www.ukgser.com/forums/showthread.php?t=134046
Expensive? Yes.
Does it work 100%? Yes.
Will you be able to sell it on when you have finished with 1200GS ownership? Yes.

