In many partnerships, I play double of a strong NT opener as penalty (mostly because I like a simple NT defense I'll remember). When it comes up I find partner and I are often not on the same page and either partner pulls a profitable penalty double because he (unsurprisingly) does not have too many values or on the flip side, he sits and we are -180 (or whatever). The lack of good results from playing this treatment has made me want to drop it. I found the notes by Frances Hinden I found here https://www.bridgebase.com/forums/topic/51777-follow-ups-after-a-penalty-double-of-1nt/ useful, but think some of the issues I have are a little more basic. Here is a (non-exhaustive) list of questions I have for those who (preferably successfully) play penalty doubles of NT openers (and I assume that's most of you against weak NT openers):
Benefits include:
Plus... it's free!