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Obviously, I wouldn't use it on a bike that wasn't absolutely fucked
As long as you're just using impact to undo stuff, and you've made sure there's a sound fit between tool and fastener, go nuts I say - impact is indeed a game-changer. 1/4” size (screw gun) is even more handy on a bike.
Come to think of it, maybe there's some way adapt a rack and pinion from a car so you can use a rattle gun to remove a seatpost...
Kimmo-
The forces in removing a stuck seatpost are quite significant, how much force can steering components create? My idea was to build a similar gilloutine looking contraption to what was linked above, but use some stuff like spring compressors I already have.
here's quite a simple way to turn a stuck post and make noise https://youtu.be/P-YpmDx86d0?si=jyTypVg0waA2F0I0
Jokke_A
Obviously, I wouldn't use it on a bike that wasn't absolutely fucked, this was exceptional circumstances