I would like aluminium as well. My intended build won’t be high output and I don’t want to have to worry about galvanic corrosion between copper and aluminium.
My order arrived nice and safe over the weekend. It gets installed today, but I already opened it and the retaining ring threads into the pill like butter.
If anyone's wondering, it was packaged nicely and took 20 days to reach the continental US, with tracked shipping. As expected, and I'm quite pleased.
Mag D sets are sold out, but I still have 3 empty drop-ins.
If nobody is interested in custom pill for bigger pcb or custom optics or etc., I will make same 16mm pills as were provided with my sets and sell them as is.