Update: 1/12/17 After using it for a number of times, guess there's some issue which need improved on the next version:

1. The mob string keep tangle with the two bolt head..
2. Using the mob is fine, just that maybe the base is too round, it tends to rollover... will need to add teeth or grip so that it can use it as a rubbing tools.
3. The new design will probably be screwed type rather than bolt ... will see.

Update: 10/9/17 The mop head attachment was broken, so I recreate a mop head adaptor. I design a new flower base with two screws to tighten. Also put additional curvature on the bottom base so that during mopping, the pressure will create better force on the mop string. The new base will have more rooms for the mop string to exit out. During the usage, you may need to tighten more as the mop string get wet, the gap in-between it will be lesser. Just incase the mop string get tingle up, just unscrew and redo the string and put it back... it is flexible...

You may want to also take a look at another household item design. Small Sander https://www.thingiverse.com/thing:2611160

ID card Holder https://www.thingiverse.com/thing:2583499

Myself "I make a living creating useful stuffs to help people around the world. If you like my free 3d projects, consider supporting me by tip option or paypal donation to danlim_98@yahoo.com Much Appreciated."