The amperage knob on my new 200DX seems excessively loose...far more so than any of the other smaller knobs...to the point even that I cant envision it engaging the pot, as it seems there should be at least SOME drag. Is this typical and does it warrant getting into the unit? Just pulled it out of the box and havent wired up the plug or anything, but before I did, figured Id see if anyone had this issue or if it is normal. Ran home from work over lunch to open it lol...now back at work and it will have to wait till later.