I am editing the review half a year after I had this screwdriver repaired under warranty. now I drove him in the tail and mane. For the past 3 months, his main work has been mixing mixes and drilling aerated concrete. the work is dusty and not easy. until you die. I'm changing my review from 2 to 5, he deserves it. 1) to make adjustments to the smooth stop of the cartridge 2) work on the cartridge so that it doesnโt wedge, make it more fleshy, otherwise the foil of the cartridge bell is very thin, donโt paint it black, leave it without paint, otherwise itโs scratched right away, itโs dumb to see on a new tool 3) the most important thing is not to pour the compound on the button and electronics, let there be spare parts separately: engine, button, electronics unit. If you are afraid that moisture will get in, seal the case. the compound on the electronics unit is also not needed, there is enough varnish, the mosfets burn, but they are soldered without problems in any service just with a hairdryer. the advantages of a brushless motor are negated, because it is no longer reliable due to the likelihood of failure of related parts. 4) try to get away from the special tool for removing the cartridge, let it become 3mm longer and 10 grams heavier, for that it is maintainable.