I designed this thing to make an easy access battery hatch on my "YP100" robot tank frame. I tried driving offroad without the latch and the cover kept getting pushed up when it got snagged on bushes etc.

BOM:
2@ M3-10 bolts
1@ M3 nut
2@ M3 nylock nuts
2@ 3mm washers
<1" of common RC car silicone fuel tubing
1@ print of the each stl file (2 parts)

To use this thing print one of each STL file (A and B parts). No supports or rotation is needed for either part. I printed mine with 0.3mm layers in PETG. Prepare your YP100 frame by removing the forward bolts and nuts from the top/front plate. Also replace the 2 rear nuts on the plate with nylock nuts to prevent them from loosening later on. Assembly requires an 2@ M3x10 bolts, an M3 nut, 2@ 3mm washers, and a ~16" thick slice of silicone fuel tubing. Refer to photos for assembly details. First use one of the bolts and the nut to secure the base part to the front of the frame. Next stack a washer, then the fuel tubing slice, another washer, then the printed latch part on the second bolt (make sure the flat side faces the bolt head). Now screw this stack loosely into the hole on the top of the base. Rotate the bolt to adjust compression on the fuel tubing while operating the latch. When set correctly the latch should have a positive locking detent, but remain easy to rotate to lock/unlock.