I have been using these small chokes for years! No good for HF, but 47uH is my favourite because they cover MW and a bit of IF as well. I haven't done anything to make them work, they just do!
The cans are only for show, not even earthed! When I have earthed them in the past, it has not made any difference! I never bother about "Q" or self-capacitance, or anything like that. I try it, and if it works, fine, if it doesn't, try something else. I haven't begun to devise a coupling between V2 and V3 yet that uses modern components. In the past, I have used matching transformers, or even small mains transformers and they seem to work OK. I have made superhets using only RF chokes as the aerial and oscillator coils - no problem.