Here is a video showing how to use the slide hammer tool to remove the Compass axle. The video shows how to use a punch to install the bearings at the end, though using the drifts is preferred. The instructions below show how to use the included bearing drifts to install the bearings. The drifts are designed to fit on the Park Tool headset press and crown race installation tool.
https://www.youtube.com/watch?v=ne4CtD4O0pk
The EVELO Compass axle tool comes with a specially machined coupler and bearing drifts, as shown below.
Assemble the slide hammer by fitting the washer and weight onto the shaft as shown.
Thread the coupler onto the end of the slide hammer.
Set the Compass on its side.
Undo the outer axle nut by rotating clockwise (reverse threaded).
Remove the inner nut by rotating counterclockwise (regular threaded).
Lift the wheel off. Make sure not to lose the keyed washers on both sides of the hub. They are prone to falling off, and the inboard washer sometimes stays with the axle.
Please also take care not to lose the axle key. Leave it in place so that you can use it while threading the coupler onto the axle.
Remove the retaining clip holding the bearing into the frame.
Thread the coupler onto the end of the axle. If you need to use wrenches, do so as shown below. Remove the axle key after you have mounted the coupler. It does not need to be especially tight, but you do want it to engage nearly all of the threads.
Everything should look like this when you are ready to pull the axle. Slide the weight up the shaft with force to pull the axle out of the frame. See 1:35 in the video link at the beginning of the instructions.
Typically, the axle will come out easily. If you don't succeed quickly, enlist a partner to hold the trike down and steady while you use the slide hammer.
To prepare for installing the axle, apply a light coating of grease to the bearing bore and the axle splines.
Insert the axle and engage it in the differential. You may need to wiggle/rotate it a bit to get it to seat into the differential.
Fit the bearing over the axle and line it up to the frame.
Use the drift with a lip to fit the outer bearing in (the drift with no lip is for the inner bearing). Place the drift flat side down, lip facing up. Seat the Park CRS-1 inside the drift and drive the bearing in with a hammer. When the bearing is fully seated, you should be able to feel and hear the difference when you strike with the hammer. You can also check visually that the groove for the retaining clip is exposed.
Install the retaining clip, grease the axle, and install and grease the key.
Make sure the rear wheel has the keyed washer on both sides of the hub and install the wheel.
Install the inner nut by turning clockwise and snug it down. Don't tighten it much.
Install the outer nut by turning it counterclockwise while holding the inner nut with a wrench.