Spatula Palette Knife Handle

I have broken the wooden handles that came with the set of spatula palette knives I bought to remove prints from my printer table. I have tried several of the other printable handles that are available on Thingiverse but have also broken them. I had a handle I originally printed for an early version of the conductor's baton I have posted here on Thingiverse. That handle which has a 5.5mm shaft hole was perfect for replacing my broken palette knife handle. I made a second version with a 3.5mm dia