This simple wood adapter ring lets me plug the hose from my shop vac into the back of my new table saw.
It made a huge difference in the amount of saw dust on the floor, in the air, and in my lungs, after running the saw. From now on, I'm not running the saw without the shop vac.
The adapter was made from scrap wood in about 10 min. That beats the hell out of ordering an adapter kit from amazon for $12 + shipping, waiting a week, and then finding out the kit is not quite the right size for my application because I measured outside diameter instead of inside, or something dumb like that.