The term 'conservative force' is vague and conveys a slightly misleading impression. 'Conserve' originally meant 'preserve', so a 'conservative force' preserved its force and power, in other words it was and is a 'continuous force'. So-called non-conservative forces are brief, explosive forces which cease once they have moved an object. If I hit a ball with a tennis racquet that sends the ball through the air, it travels onward due to the impetus I gave it but it ceases to move once the energy given to it has been expended. The same applies to billiards, pool and snooker balls, these are not conservative forces because their force is not conserved.
When I say that a conservative force is a 'continuous force', I mean that it is not a one-off explosive force but rather a lengthy, continuous force and although the length might be very short, it is still not the explosive force of a hit, but rather an extended push.
So those who claim that gravity is a conservative force and therefore cannot be used in Bessler's wheel are utterly wrong; it has to be a conservative or continuous force otherwise it wouldn't work.
A windmill goes round because the wind applies force to the sails; a water turbine rotates because water pressure is applies to the turbine blades, gravity wheel rotates because gravity applies force to the weights. We don't call a windmill a sail wheel, and we don't call a gravity wheel a weight wheel, We refer to diesel, petrol of gas engines because they run on those fuels, but actually it's not the fuel but the internal combustion of that fuel which drives the pistons and hence the crankshaft. It's not gravity that drives a gravity wheel but the weights which fall under the influence of gravity.