Tensioning-Aid-Clip for fretsaws

In the kindergarten of my youngest (5) the kids love to work in the workshop where they can use all kinds of tools like drills, hammers or saws. 

The blades of the fretsaw obviously don't last long, and exchanging is challenging for the teacher with small hands. This tool helps to insert the new blade with the correct amount of tension. 

Clip this tool to the saw, and you have your hands free to mount the new blade. I'm also looking forward to provide new (bigger) thumb-nuts, so maybe even the (older) children can mount new blades.