I recently converted my Scubapro mk25 from yoke to DIN. A buddy gave me three steel tanks with different valves. Two fit, but the one, Sherwood, doesn’t work. When I screw the regulator all the way in it’s still a little loose and when I turn the tank on it leaks, like the o ring is not seated. I screwed a DIN adapter in at the shop and it goes in far enough to fill but it definitely goes in much further on that valve then other DIN valves on other tanks. Are some valves deeper than others? Is there a fix or do I need to replace the tank valve?