Im looking at to add a small rims tube to my setup strictly to hold mash temp not for stepping or anything , i mash in a modified mash and boil,lodo and boil in a separate kettle, the M&B swings too wildly during the mash so id like to help fix that, still works and i get conversion but the OCD in me would prefer steady temps, i brew small batches 2.5-4 gallon max, i emailed some vendors who sell such equipment but no response so i figured id ask everyone for some advice or ideas