Well, you need to find wood like that. Unless you can chop down grapevine, de-bark it, dry it and disinfect it all yourself, you need to buy them. It's not like you can turn smooth pine into something like that.
I save small metal jar lids and run them through the dishwasher. Poke a hole in it with a philips screw driver so you can use it as a big washer. Get a branch and wash it with clean water many times. Drill a hole in the branch and anchor it with the big washer and a screw.