Originally Posted by
biker128pedal
Look here. You may find something compatible. I would not be surprised if another brands fit. If all else fails get another handlebar lever. Does not need to be the same brand.
https://www.loosescrews.com/
Pretty sure OP is talking about the barrel adjust ON the brake caliper...if that's the case hit your local bike shop and see if they have a random one laying around. If so, install it...BUT...do NOT use it to adjust the brake. Only adjust for pad wear by moving the pistons in. Plenty of videos on YT.