Filament Rack Dowel Cap

I printed out the Filament Storage Rack 28MM project. I loved it however the Dowels need some sort of an end cap so the Dowels dont slide out. This is just a simple file with a hole in the middle that allows you to screw in a basic drywall screw into the dowel and now i can move this around without any worry the dowels wont slide out. Enjoy.