Step 3: Reassemble and go make yourself some coffee
Take the portafilter off the chuck, put the spring back in, drop the basket in, screw the handle on, and call the project done. The only difference ...
Inspired by asc2 asking on my homemade tamper instructable if my bottomless portafilter was a DIY project I grabbed a spare portafilter and headed to techshop to see if I could successfully lop the bottom off. This is a pretty simple project if you've got access to a metal lathe. I don't have one at home so I made it at techshop.
Step 1: Disassemble the portafilter
Start by clamping the portafilter in a vise and unscrewing the handle. The factory was nice enough to use loctite or something similar so it was a pain to disassemble it. I was worried that I would ruin the handle so I brought along a rosewood handle that I made a few months ago. I think if the plan was to keep the same handle I would clamp the body of the portafilter in the vise with a scrap of wood on each side to prevent it from getting all banged up.