This is a small rail based dolly I’m making with a set of helical gears inside. The only force that is generated is by it being pushed by hand up and down the rails and turning the fly wheel to create inertia for a smoother shot. As I’m putting it together I’m wondering now if normal bearings will be ok with the helical gears generating axial force, do I need to look at other bearings or would the forces involved be too small to be of concern? While I’m here I thought I’d ask if my choice of gear MOD, their 1.5 at the moment , seems appropriate? The gears are Nylon and steal mixed and between 25 and 80mm.