can you share a photo of the end of the freewheel? remove the wheel and the axle nut or skewer that's in the way. or share a photo of a product photo of the exact same item.


this photo is pretty clear. if yours looks like this, the 12 splines in the middle are what you use with a tool like the Park FR-1.3 to remove it. there are a few tools available that LOOK like that 12-spline tool that are for cassette lockrings and Shimano Centerlock disc rotors, but that is not the same tool, so don't mix them up.

I am familiar with that four-slot lockring, but I've never had to tighten one. the last time I saw a loose freewheel, it was because one of the spacers between the cogs had shattered. there was no way to fix it at that point. if the lockring is really loose, try removing it with your fingers. it might be "left hand threaded" and come off when you turn it clockwise. if it comes right off, slide the cogs and spacers off the freewheel body to inspect them. it's fun to take things apart! clean and reassemble. the trick will be getting that lockring tight again, which is the main reason you came here. unfortunately, I don't have an answer for that. I have never known those to be serviceable. I'd like to know if anyone knows where one of those tools can be found. obviously it exists because Sunrace assembles these, but it might be a one-off special tool that part of a machine where they mass-produce these in Asia.

you'll probably need to get creative with some Loctite 424 and tongue-and-groove pliers.