I use a 7/16" six inch long dowel rod. I place it in the center of the full moon clip and push the clip down over the extractor clip of the case. That is as basic as it gets!
The De-mooner is a piece of copper 5/8" OD plumbing water pipe (or 5/8" OD electrical conduit), cut so there is a tooth that sticks up 1/4 or less of of the end circumference about 1/8". (Many make these from broken golf handles too) The rod stores inside the tube. When I got around to making them, I made 3 sets and put a set in the range bag, in the ammo can, and on the loading bench. As an additional piece, I like a piece of wood trim for Crown molding, and lay 6 loaded rounds nose to rim in the round grove. Then with the dowel rod in the center hole, go down the row and in about 3 or 4 seconds, the clip is loaded.
Brownell's sells a nice de-mooner for $20 that work the same, but only looks nicer.
Brownell's also sell a bag of 100 full moon clips (last one I bought was $30 about 5 years ago!) So I have well over 250 full moon clips, and keep a 50 Cal Ammo Can full of loaded clips ready to go.
Ivan
If you go to Home Depot and buy everything new, you will have about $5 in 3 or 4 sets. You could get by using one tool; a hack saw.