I made these tools some years ago....
The ring is for YS crankshafts that have a ring. This ring is cut from a brass sink drainpipe....I just knew I would find a use for it!!
The other tool is 5/32" music wire with a slot ground to the depth of the inner race of the cam bearings.
There is a wheel collar mounted up the wire out of the picture that is used as a stopper for a slide weight (a piece of maple wood with a 5/32" hole)
To use....insert the wire through the hole in the maple block...then insert the tool through the inner race of the cam bearing (in the crankcase)
Then using a tool....slam upward on the maple block to remove the bearing.