Ok, so you are splitting 120 film, that make sense. I have a 100' roll of HP5 negative super 16 so I snip off what I need and I have about 6 cassettes.
Which camera are you using?
I have the Jobo 16mm reels and they work great for processing.
I used to use 16mm SS reels and found they loaded easier if loaded with reverse curl (emulsion out).