SOURCE: How to replace the hammer and striker
Sorry I couldn't be of more help. I've looked at about every DV 20 version parts list and cannot find a part 16 that would create any difficulty in removing. All are either gears, pins, or the plate that goes under the switch. from the way you are describing it it sounds like the only possibility would be the Model DV 20VB which has a spindle which has to be unscrewed from the drill chuck it is held in by a retaining clip that you would need retaining ring pliers to remove.
A common failure item the switch is going bad. You need Dewalt part number 152274-19SV. They're not hard to replace but shop around the web for one, these switch usually run between $45 and $60 plus shipping.
SOURCE: how sds drill differ from ordinary rotatary drill .what are main basic feature of sds hammer drill
The difference is the working action. SDS drills use a corrugated cams running against each other.
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