Hi I have a few questions for the SB-220 owners out there. 1st: Looking at pictorial 4-5 in the manual it shows a brass spring like device touching a metal shaft. Is this a type of HV interlock? See Pic attached. Also if one were to remove the perforated inner lid and apply power would it go poof? Snap crackle pop? 2nd: I read where the input coils have some problems matching modern rigs. Is this true? If used will it show high SWR on the radio? I know they can be tweaked just wanted to be sure. That's it for now if I have any other questions I know where to ask them. Thanks folks I appreciate any and all input.