I take it that no one knew enough to help you? That's a bummer.
Two young men were kind enough to work on it for me. Only one guy there that does a vapetv show even knew that the R91 had a v2. I had to show and explain what the problem was and how to tighten down the positive block and how to use the spanner tool. Thank goodness I brought all the tools with me. I walked them through it.
The post is tighter but still can be moved pretty easily. He could not get it tighter with the tiny spanner tool and vise grip or needle nose pliers I brought. It was good enough to get a 1.4 ohm coil built. It read 1.4 ohms on his SVD, 1.3 ohms on the little ohms checker black box I bought at the meet, and my provari kept popping out an E1 error. My MVP2 would fire it ok but the ohms did vary up to 3.8 for a bit. I made sure my provari was set to 3.2 volts and we put the r91 back on it. It fired.
So now I am using it on my provari mini at 3.7 volts and so far (for about 2 hours) it is still reading 1.4 ohms. It is a very good vape with a well loved flavor so I can tell if it starts going crazy on me.
I do believe that I am going to want the v1 center pin, even if it is not critical to the r91's use. I do not like that the block is not tight. We will see if the resistance holds over the next hours and days. I am going to make sure I get whatever fix Kebo is going to offer.
I like the vape on this device very much. 1.4ohms is lower than I normally vape at so I am not sure if it is the best vape ever. But it is the best vape I have ever had outside of a dripper. And I drip 95% of the time. So this may be the device that sets me free.