To comply with your 2019 resolutions, here are pump handles with unstable balance on a spherical surface.
For even more intense muscle work with the spherical surface that causes instability. Improved ergonomics for the benefit of classic hand to ground pumps.
You may also not use the half sphere for less unstable and less physical work.
Multiple handle versions available for even more motivation:
No pain no gain
Never give up
Go hard or go home.
-Glue the two clips in the half sphere.
-Insert the half sphere and turn it to lock it into the groove.
-Cut a steel or aluminium pin Ø8 length 125.5.
Insert the pin into the handle, then insert it into the grooves of the base.
If necessary, print the simple handle with a flexible filament...
No support required normally.
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