Years ago, a product called Hydra-locks was offered to convert your air operatedd retract gear to hydraulic operation. Does anyone know why this was a good idea? I can see down sides in the form of leaks, added weight, bubbles in the system, but cannot think of any benefit. Has anyone had any experience with them?
Thanks,
John H.

It looks to me like an outstanding way to add weight without any significant functional improvement.

it gave very scale like retraction both up and down but beware of leaks it makes a terrible mess
if you loose a line or have a leaking air cylinder

A wheel collar will slow down air retracts for the same effect.