Flex BL Drill Bit Holder uses the stock screw and can mount behind the belt clip 

Intended to be printed with embedded magnets (8mm x 2mm round) - two per slot 
I used the ones from: https://www.amazon.com/dp/B09WZTSQ9Y?psc=1&ref=ppx_yo2ov_dt_b_product_details

make sure to pause at the right layer so you can insert them. Don't forget, some nozzles are magnetic and won't work