Handle for hex nut

Attachment to 0.4" bolt head. The hole can be tapped with a 1/16" NPT tap and plug inserted to tighten the flexure in the handle onto the bolt head.

1/16" NPT plug:
https://www.amazon.com/dp/B07FCSHH9R/?coliid=I11SG4DFL883SZ&colid=YACM7I4IG922&psc=0&ref_=lv_ov_lig_dp_it

1/6" NPT tap:
https://www.amazon.com/Drillco-Carbon-Uncoated-Bright-Chamfer/dp/B00GPDYWYG/ref=sr_1_4?keywords=1%2F16%22+NPT+tap&qid=1551723156&s=hi&sr=1-4