Macro converter for Nikon

Hi, this is my version of the macro converter (revert lens) for Nikon with F mount. It is designed for 52 mm lenses, tested with:
- Nikon AF-S DX NIKKOR 18-55MM
- Nikon AF NIKKOR 50mm f/1.8D

Part 1:
You need to put a UV filter on the one side (tight fit) and other side mount at Camera body.

Part 2:
It is a protective part designed to mount on the reverted side of the lens. You can also screw another 52mm UV filter to protect lens glass.

On both parts, you can find dot marks which w