Here is a case in point, the owner has tried their best to remove this sealed unit from the frame and consequently ruined the tool engagement splines. Compare it to a new unit:
This almost certainly happened because the tool wasn’t secured to the cup. In most cases this is not directly suggested by the manufacturers (probably because it draws attention to the fact that they have palmed you off with a half-baked product produced as cheaply as possible) but something I always do regardless of the condition of the frame or bracket simply because it prolongs the life of the tool by ensuring all the turning effort is rotational and some of the force applied isn’t converted into a prising action like removing a beer bottle top. Fortunately the solution is cheap and doesn’t require the purchase of a more sophisticated and costly tool. Just find or purchase a large thick washer or reinforcement plate wide enough to span the outer face of the tool and with a hole large enough for the crank bolt.
Late edit: It’s worth adding that no drastic action is taken before a very liberal application inside and out of release fluid -preferably at least 24 hours before.
