It's been done: https://en.wikipedia.org/wiki/Pendulum#1673:_Huygens'_Horologium_Oscillatorium https://en.wikipedia.org/wiki/Pendulum#1673:_Huygens'_Horolo...

It's been done: https://en.wikipedia.org/wiki/Pendulum#1673:_Huygens'_Horologium_Oscillatorium https://en.wikipedia.org/wiki/Pendulum#1673:_Huygens'_Horolo... >To make its period isochronous, Huygens mounted cycloidal-shaped metal 'chops' next to the pivots in his clocks, that constrained the suspension cord and forced the pendulum to follow a cycloid arc.[53] This solution didn't prove as practical as simply limiting the pendulum's swing to small angles of a few degrees.