Finally got around to making a proper stir plate for my 5000ML flask. I could not find any cheap versions for a large flask.I had some issues with using a 2 inch stir bar so I went down to 1 inch and it works fine. The wood is a soft wood that I had hanging around the shop. I hollowed out the back for the computer fan. The wood is 1/4 thick over the magnet. The fan is held off the wood by 1/4 spacers. Rubber feet allow for air circulation. Standard rocker swithc for on and off and a rheostat for speed control.
testing to make sure it works before solder.
If I had to do it over I would make a removable power cord.