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Hi, I have a Makita HP1621F which is a keyless 1/2” hammer drill. It’s a nice drill, but the chuck has finally failed on me. It will tighten, but after a few minutes use it loosens. First question: does this mean I need to replace just the chuck or might the problem instead/also be with the spindle, compression spring, ball bearing, retaining ring or helical gear, all of which have a bearing on the chuck (see the parts diagram at: https://www.ereplacementparts.com/makita-hp1621f-hammer-drill-parts-c-97_16247_1585.html) I’d hate to throw it away for want of a