As far as reinstalling things like bearings if one has something like a socket that is close to the same size as the outer race to use against the bearing, a pretty simple press can be made out of a length of threaded steel stock, a couple of hexagon nuts that is the same thread size and a short piece of 1/4 inch or thicker, flat steel bar.
The threaded stock should be as large as possible but still fit thru the square drive on the socket.
Drill a hole thru the short steel bar that clears the threaded rod.
To use this, place the flat steel bar on the far side of the bearing boss with the threaded rod and a nut thru it, the boss, the bearing and the socket.
Put the other hex nut on the threaded rod so it rests against the top of the socket.
Tightening the hex nut will force the bearing into the liner without pounding on it.
If a 3/8 inch threaded rod was used with 18 ft/lbs of torque on the nut a force of over 3000 pounds will be driving the bearing in place.
If a high quality threaded rod was used so the torque could be increased to 28 foot pounds and it was oiled, the pressure it would generate would be over 5900 pounds.