Do you have a photo of your Suntour? While I was a huge fan of that company, the 2 Suntour coaster brakes that I have are 'rebadged' KT's (Kun Teng) like the Shimano hubs. Having said that, I do have an old Shimano hub (the origin of which is still a mystery) that is quite nice. The internals are almost a clone of the Sachs cone-clutch design with nice beefy shoes. The outside, unlike the Sachs, uses pressed-on flanges but the entire hub is definitely stronger (and heavier) than their current KT offering. Now I'm wondering if Suntour offered such a hub.

Have you had your hub apart? Do you have photos of the guts? If so I would love to see them.

Thanks

Jim