Conversion of Files

1. Don't forget to press the Like button. It's the only form of "payment" the uploader gets.

2. I don't think all the files are present. I downloaded, liked, imported, and converted the assembly file, but it shows no handle. The "filters" are cylinders, so I have to assume the handle was the more impressive model.
Importing the "hefboom" models gives no geometry. I have to assume boom = handle/lever. Maybe they are broken? It looks like they may have been made with some iterative design function in the software for weight/material optimization.

3. Par files are from Solid Edge? I've never seen one before.

Step file attached.
I think you'll need to redesign the lever based on the jpg image of it.

try this site https://www.convertcadfiles.com/

Good work! I was able to open it in FreeCAD and it shows no data loss. When you try to save the file, it will use *.txt extension. Change it to *.stp and import in FreeCAD.

Amod