I own one and have used it on 2 GL1800s thus far-
An indispensable tool in my opinion if you are doing fork seals -
These set the seals properly and easily without damaging the edges like can happen with other methods.
$25 is a deal -- someone should buy this asap.
I installed the mono shock and also the All Balls steering bearing. Oh yea! big difference in handling and no more shimmy. I also installed the shim on the front brake to eliminate the anti-dive. As a result, I had to buy new bottom engine covers due to cornering too aggressively and scraping them. I'm not going to drive my new wing as aggressive, at least until I get more in tune with it's handling.