[1999Mariah]

Well...turns out my seat hardware is both Springfield and Garelick parts. There were 2 thin plastic bearings inside each seat that I ordered from Garelick and put replaced, this helped a little, but the wobble is still pretty much there, I double checked the tightness of all the bolts, they seem fine, when observing the seat from below the wobble seems to occur on the mounting point (i.e. where the circular bracket of the bottom of the seat sits on the cylinder of the seat post.

[mikeyt]

Maybe its the mix of parts from the 2 different manufacturers. I know Springfield tried to tell me a Springfield spider would fit a Swivel-eze pedestal post and although both said 2-3/8" the Swivel-eze people used a different tape measure than the Springfield people & they wouldn't fit properly.... i ended up buying all Springfield parts & they worked fine.

[1999Mariah]

That sounds like it may be the issue, like the garelick spider on the seat doesn't perfectly fit the springfield mount...bummer.