Update: Added arrow for locking rotation direction, the hood is now exactly 80 degrees, and added shallow grooving.

Made to mount on the outside of the Nikkor AF 24-120 3.5-5.6D (which afaik uses the HB-11 hood) Conical shape because i didnt know how close to vertical i can get without causing vignetting. Mounts both normal and reverse, locks in too. (Rotate right until it clicks in, might need a bit of force, but it holds on really well, rotate left when you want to lock it in reverse for storage.) Will eventually design better/different versions, feel free to comment on tweaks.