Fupa 12 Diffuser Kit with Install tool 1/8th-3.2mm Allows over 250 amps DC
Comes with Install tool that aids in screen installation.

Step 1 – Install the empty Glass or Ceramic Cup on your torch with a 3/32 tungsten installed
Step 2 – Install the screen over the Tungsten with the Cupped side first
Step 3 – slide on plastic tool and evenly apply pressure to the Side flange of tool , With a little pressure the Screen should Seat in the Cup perfectly,
You want the Screen to look like an Hour Glass when installed with the Screens sealing against the sidewalls of the Glass /Ceramic as shown in the Picture
NOTE- You may have to Cup the screen with your fingers more if it snags on the Ceramic.