I just made the jump and converted my MK25 from yoke to DIN. I'm having a hard time removing the yoke-to-din adapter from my pro valve on my Worthington tank. I've bent 2 allen wrenches (made in China - most likely the culprit) and am now a little apprehensive to attempt it again. Is there a reason why it's so hard? Is it because of salt deposit? Is it ok if I soak the valve with 'salt-away'?