You can print this without support.
It gives two diverent versions of holder and lever.
Holder Version 1
For existing screw. Support is allready in the STL File
Holder Version 2 (i prefer)
Is beter to fix but you need an new screw (M3x25)
To conect the two pieces, just take a short piec of filament and put it through. Burn bothes sites. finish