[Closed] b screw locking device help please!

so, like a donkey i lost the little plastic locking device which pushes into the mech body and acts a bit like a nyloc for the b screw. it fell into my nuts and bolts drawer and i have spent at least 30 minutes emptying it all out and going through it all. i cant find it. it's gone forever. until about 5 minutes after a buy a new one and then i expect it will appear again...

can you get them anywhere? its an slx one with a clutch. i was trying to put a longer b screw in - until muppet features here lost the locking device. Also, can you get a longer b screw anywhere? it's M4 but u dont have any socket screws which i think are easier to use than jis/philip headed ones