With regard to my comment on the safety issues of hand propping a Cub from behind the prop.
My first job was flying a Cub crop spraying in southern Ontario.
We were taught to hand prop it from behind for these reasons.
(1) You are behind the propellor and not in front of it if for some reason it starts at high RPM.
(2) Being behind it you have a grip on the airplane to counter balance the force of pulling the prop through. This is the same on wheels or floats..in fact I have never met anyone who hand props a Cub on floats standing in front of the prop.
(3) If for any reason you need to stop the engine or throttle it back you can reach the controls.
There are other issues surrounding hand propping but those are the main safety related ones for me, but remember the above is only my opinion and must be taken in that context.
Chuck E.