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These ones. https://www.lulzbot.com/store/parts/spring-6-pack-6mm-od-97mm-fl If you look at the idler, there is a latch holder that slides up and down to lock it in place. it's tension is adjusted by spring tension currently. Those springs may at some point get replaced with silicon washers, since the amount of adjustment doesn't seem to be the same range as needed by a wade extruder so far. Right now having the longer spring travel makes sense though because you can just tilt the latch up at an angle to release the idler. The slider mechanism works too, its just a pain to get all the support cleaned out of the channels at the moment. But for now it works, and works well. I do think thats an area I can improve on further though. an idler latch with a finger rest tab to make it easier to unlatch is also in the works but isn't done yet.