Repairing a Makita DTD154 Impact Driver with a broken gearcase.

This how to replace the gearcase on a makita DTD154 impact driver with failed needle bearing in the front gearcase.
A broken needle bearing will cause the impactor to run very rough, loud and will cause excessive movement in the spindle.
It's a quick and easy repair anyone could do at home, amd most importantly it's a cheap fix.
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