Steve Herr's full tune of a 0.20" cal DIANA 54

Steve, want to clarify something. After asking Hector to build a HPM for my 56T/H, my understanding from him is the 54 and 56T/H do NOT use the same HPM because the barrel shroud length is different. You can use the OEM 54 HPM on the 56 but you have to replace the barrel shroud with a different length. Or, you can go with Option B and get the 56 HPM from Hector. Beautiful piece of work. Please correct me if I’m wrong about any of this.
Yes, that is correct. The shroud is shorter on the 56TH, so Hector will supply a longer tuner.

Steve