Sorry for the needless confusion. So my kids are big fans of JT. I was watching your video as they walked by and thought it was JT wrenching on motorcycles. I had to break their hearts after the video was over.
The number 75 mm came from the service manual. The tool is called a fork oil level tool and measures the distance from the top of the tube to the oil level.
It was actually a broken bushing. It may have broken when the bike was crashed. I guess I should have included a clip of that in the video. Sorry about that 😕
Good question- sorry for not including it in the vid description. "Grom" is not listed in the title of the product, but check the item description. This is for the 2018 Grom forks (may fit other years). This is an affiliate link that I get a very small commission on if you use. amzn.to/3U43T9m