Bluecold wrote:There's probably a slot for the lever pin to move in.
This is correct, the fulcrum pin is inside of a slot. The Piston shaft also has a Teflon bearing to help keep it vertical. I have the movement all animated in CAD.
Espresso strietman machines have an external bayonet, perhaps easier to make.
I think you're right. This would at least make it possible to machine. You've reminded me that another option might be be to externally thread the GH and screw on a basket holder instead of a true portafilter, like the flair.
Another option would be a conti lever group bell.
This is the type of suggestion I'm looking for, thank you. Their parts look well made and available. The closest thing I could find to the bayonet in a few minutes of searching was the shower assembly. Going to need to search a little more this afternoon to find the bell. I love that the shower assembly bolts around the outside instead of with a bolt in the center.http://www.cafeparts.com/SubCatFilter/4314/524/0:55/3http://www.cafeparts.com/SubCat/1554/402/5