The Fred
Veteran Member
A quick fix or try would be to add a rubber jounce bumper from a car suspension. There are many varieties if you could get your hands on a few from an auto parts place or if you have a go to shop that does suspension work you could at least look around to find one to try. Cheap fix and easily placed under the seat near the stopper to try.
Different materials like urethane that come in different compaction rates (for lack of a better term).
Different materials like urethane that come in different compaction rates (for lack of a better term).