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Turn the new cartridge over and reinsert into the head with the blade facing the CMC board and the notch on the back of the cartridge facing the head.
It should click into place.
- It can only be inserted one way.

Change to the 90 Degree Blade Cartridge

Info
The 90° plastic green blade cartridge is designed to cut 90° bevels on standard 4-ply Cartridge cuts a 90° Right Angle into the matboard. The 90° plastic green blade cartridge Green 90° Blade Cartridge is labeled “90” with a 90° Angle Symbol on the Cartridge end.