Yeah, I change mine in as many seconds, too. Some of the posts wear insert tooling, others HSS and as somebody (animal) suggested, there are four different tools available on each post. Just undo the top screw, turn the post around, and you're away. What could be simpler and without the expense of so-called QC toolposts? I have one which has tooling for O-rings and the other side has a cemented carbide threading tool: that's a 2-way job. Then there are three other 4-way jobs and lastly, there's a 3-way, triangular (sort of) post, which allows some unusual approach angles and often can save changing and packing tooling, if it ever comes down to that. My toolposts are made from 4"x2" black mild steel solid. The tool grooves are drilled out from the solid, then milled to final size and shape, having drilled the hole for the post itself. Simple, but can be heavy going. I have also made another post attachment which carries a small hacksaw blade in a reciprocating frame. The reciprocation is by hand, but the thing is very handy for slotting small screws, when I can't be bothered setting up a mill. An issue with tool posts are the setscrews. Just any 'ol setscrew won't be much use, as the ends will mushroom and getting the screws out might be a problem, if you ever wanted to. There are very much hardened, square-headed toolpost screws available- or there used to be - and these are the goods. Socket-head capscrews will often suffice, being usually higher-tensile and tougher, but not as durable as the proper square-heads. I'll send some pix of the toolposts: I'm not in my shop at present. I have always thought that tool changing is most conveniently done with a collection of posts: a bit 'old fashioned', if you like and I've never been convinced of any real benefits of the QC posts or attachments.