Hi!
It doesn't work!!!!
The way all ball bearinged glow engines are made is by having the crankshaft secured to the front ballbering by a ridge on the crank on one side and by the drive washer cone on the other side of the ballbearing...this front ball bearing is the only part that holds the crankshaft in position when the engine turns.
When you try to start the engine by using an electric starter then you push the crankshaft back a little...the front ball bearing take up this pushing action but if the bearing is a little worn ...the crankshaft pushes against the back plate.
But this is not that critical, small scuff marks on the inner surface of the backplate is just normal.
But if the whole backplate surface is scuffed you better replace that front ball bearing.

Regards!
Jan K
Sweden