Hi i've remixed this Robocop (1987) Grenade from the creator link to his work is original work  below 

“https://www.printables.com/model/163343-robocop-1987-grenade/remixes”. 

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with screw lid version made by me my link https://www.printables.com/model/759643-robocop-1987-grenade-with-screw-lid

I added a screw lid to the model; it will feel tight. You have to wear it in. Just screw a bit, then unscrew. Keep doing this until it is easier to remove.

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this below is from the original creator 

You will also need:

• 1 x 3.2mm x 25mm Split Pin (cut the longest leg of the pin to the same length as the other with a dremel/rotary tool, and round off the ends with a grinding wheel)
• 1 x 25mm Ring Pull (you can get from an old key-ring)
• 1 x M3 Washer (goes between the button and the spring inside the fuse assembly to prevent binding)
• 2 x 6mm compression springs, 15mm in length, 0.4 - 0.6mm wire diameter. One spring goes inside the fuse housing for the button, the other goes in the recess on top of the fuse housing.
• Superglue / paint / primer / sandpaper
• Acetate sheet for LCD display
• Inkjet or Laser print to print LCD display output

this is the creator NOTE ON SELLING THIS MODEL:

I have no issues with you printing and selling physical copies (either completed or in kit form) however I kindly request that you give credit to myself as the designer.  This work is licensed under a
Creative Commons (4.0 International License)
Attribution

✖ | Sharing without ATTRIBUTION

✔ | Remix Culture allowed

✔ | Commercial Use

✔ | Free Cultural Works

✔ | Meets Open Definition

link to his youtube