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https://www.gardenspareparts.co.uk/
Black & Decker DeWalt Elu Plastic Knob DW742 TGS173 TGS271 DW743
Genuine Spare Part.
This knob is used on a variety of different machines. It is usually used to tighten up screws against a fence of some kind. The thread on these can wear down and over time they can begin to slip. Once this happens this part will need replacing.
Please see suitable models below: