The 41mm tamper and handle came today, so I've been playing this afternoon. I got the one from Amazon, since it was immediately available and prime shipping - not really a looker, but certainly functional:
And OMG what a difference having a tamper sized for singles makes! It takes a little doing (and a few pre-tamps before the tamp) to get all the grinds in the hole in the bottom (that funnel would be nice!), but once they're in there, a solid tamp, then pull. And I'm getting picture-perfect pulls on the bottomless, which are somewhat adorable from a single.
And I never would have believed this - but I'm using exactly the same grind setting in this basket as I am in the double, and getting the same extraction time. I mean, I know this is what they _say_ you should be able to do, but I've always been skeptical, and have never witnessed this myself...until today! Specifically:
LM 7g basket, 8.0g in, 16g out, 22s
LM 17g basket, 16.0g in, 32g out, 22s
This was definitely not the case before, but now that I can get a clean tamp in the single, it's flowing perfectly. This is with the La Colombe Nizza, from the LM Home subscription.