These mounts are for 30mm diameter die springs to isolate the pedals, floor board, or seat in a sim rig with tactile transducers to improve the feel of the shakers in their mounted location and reduce vibration transfer to the rest of the rig.

Compared with other methods (springs with bolts, rubber bushings, both of these together) using a free, but laterally constrained spring produces noticeable improvements to isolation and shaker efficiency.

The various mount heights let give options to use longer springs for better isolation while constraining the lateral and longitudinal movement. 10mm of unconstrained spring will have under 2mm of lateral movement, even with ~100+lbs of force.
25mm of unconstrained spring will have up to about 1cm of lateral movement with the same force.

Yellow die springs are recommended. Their load rating of ~700N works well with normal sim rig weights. They are also cheap and readily available.

4080 M6x3 requires 2x 20mm M6 bolts and 1x 12mm M6 bolt.

Outer dimensions are 80x60mm.

4040 M6x1 requires 1x 12mm M6 bolt preferably with washer.

Outer dimensions are 40x60mm.

This version is not recommended for locations that experience large lateral forces because it's only supported by one fastener.

40x30 M4x4 follows a 40mm wide x 30mm deep bolt pattern, it requires 4x 16mm M4 bolts for 20 series profile or 4x 20mm M4 bolts for 40 series profile. It also works well with #6 or #8 screws.

Outer dimensions are 60x50mm.

Materials: PLA-Pro/Plus, 3 perimeters, 15% gyroid infill, 0.2 layer height.