Thought I would share this with the forum. Many have the cheep little chain tool mine was under 10 bucks at my LBS. They work pretty good for pressing out a chain pin. The trick is to stop short of pressing it all the way out if reassembly is required at some point and for me that sometimes works or for some other reason I'm needing to reassemble a chain where the pin is all the way out.

I made this little gadget I'm sure others with a little skill could duplicate and it worked quite well. The gadget is a barrel that has a drilled hole that is a close slip fit with the pin and outside and length to suit your chain tool. Also a drill bit that’s a close slip fit with the chain holes. See attached photos.

I use the drill to line up the chain and also it can come in handy to lightly ream out any burr or crud in the holes by hand. I place the pin in the barrel and drop it in the tool, then the chain put a little light pressure on the pin and make sure it looks lined up (second photo) and then slip the barrel up to meet the chain and screw the pin into the chain, the barrel holds the pin straight. With mine I can get it in about 3/4 before I run out of travel. I unscrew and remove the drill and barrel and finish pressing it in.

I'm sure there are many better tools for doing this but this works for me and is light weight and stays in my tools that go touring. Hope this helps someone out.