Thanks to everyone who answered. Here are my replies:
fire_diver - yes, I expected that but have no way of knowing if the sleeves are the same diameter. That's why I am asking...hope to find someone who does know.
kathydui - LOL....thanks for answering. I have watched several of your videos over the last 24 hours. You seem very comfortable in front of the camera! Now, yes, I did figure out that the existing inner seal would have to be removed and then the DUI inner seal would have to be installed (glued?). Obviously, it would have to be the same size or so close that it would work. On the tendons...yes, I've been down that discussion about a hundred times. I walked down in the water on our entry platform, held my arms vertical and then let them down in the water....far enough for the water to rise above the sleeve cuffs BUT BELOW THE SILICONE SEAL WHERE IT TOUCHES MY WRIST. I stayed in the water for 5 minutes or so and yes, water got in. Not a lot, to be sure, after 5 minutes, but that was my confirmation that it is NOT from tendon channels, since I eliminated that by not letting the water go above the seals.
Peter_C - yes, I saw in the Waterproof forum (I'm reporting and updating the problem there) that SI-Tech has come out with a dry glove system for the Waterproof drysuit. I watched the video and downloaded the owners manual. Their system is using the same ring system that is in the suit now - the only difference that I can see is that they have a dry glove that attaches to the ring as opposed to Waterproof's wrist seal. My fear is that, since it is the same ring system, that it will not fix the problem.
I did talk to Ken at the LVDC on Friday. He is a lot of help, a nice guy and seemed genuinely interested in helping. He said that he once had a Viking suit that had a similar problem and a pressure test would not find the leak because the pressure exerted on the inside of the suit forced the fabric together where the leak was so that air did not escape.
I thought that might be the case with my problem, but I now think that it's the ring system as opposed to a rip in the fabric.
I do have the option of getting the SI-Tech dry gloves but I can't afford to spend a lot of money trying things out, just hoping it will work, especially if it is using the same seal system.
KathyDUI....can the DUI seals be ordered separately by any diver to have installed on his/her drysuit? Are you saying that it can only be installed on a DUI suit?