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There are several ways to do-it-yourself when it comes to collimating tools.

The easiest way is to just drill a 1/16” to 1/8” hole in the center of your eyepiece drawtube dust cap and use it as a simple collimating eyepiece.

If you can’t or don’t want to do this, there are other ways you can make a simple collimation tool.

Your best bet is a plastic 35mm film can. They are very nearly 1.25" in diameter. Most one-hour-type photo processors discard many of these containers in the course of their business. Consequently, they can be had free for the asking from these shops.

Two easy models:

1) Remove the cap. Get a 1/16" to 1/8" drill and drill a hole in the very center of the bottom of the can. Clean the edges of the hole with a razor knife so it is smooth and round.

Trim the raised rim off the top. Insert bottom up. You may need a turn of vinyl tape to shim the plastic cylinder of the film can so it fits snugly and doesn't slip readily either in or out.

2) Remove the cap. Get a 1/16" to 1/8" drill and drill a hole in the very center of the cap. Clean the edges of the hole with a razor knife so it is smooth and round.

Cut the bottom off the main body of the film can.

Reattach the cap to the body of the film can. Insert top up. You may need a turn of vinyl tape to shim the plastic cylinder of the film can so it fits snugly and doesn't slip readily either in or out.