I have a couple sets of the Deep 6 single tank setups. I recently did a trip and dove them a half dozen times each in salt water. I noticed on vacation that the flow adjustment knob and predive selector both became quite stiff to move after the first couple dives. I rinsed after each dive, and after returning home did a really thorough soak and rinse moving the predive lever and flow adjustment knob repeatedly. It did begin to loosen up some after working them many times but never returned to their ease of movement before they were dove. Is this normal, or does something in here need some Christolube? I ask this after reading a recent post on SB about a damage barrel and adjustment knob on a different manufactures second stage. These were very stiff after a few dives and I don't want them to freeze up over time to the point that movement could cause damage. I do understand that the thought on the other thread is that it was physical damage due to an unseen drop, or crush affect which is not the case here. Anyway I just wanted to get others take or experiences with stiffness in their Deep6 adjustments.