[VntgRads]

You say it works some.  Does that mean it works intermittently or just isn't as loud as one would expect?  I've sold many FM converters over the years.  I've probably owned about 150 of them BUT have never worked on them other than to repair an occasional antenna cable.  You're probably already doing this but just to reiterate make sure your AM radio is tuned to around 1400 then turn the adjusting screw on the converter to achieve the best volume on FM.  That converter is probably the most common Realistic one out there.  Swap meet season has started and converters are always on my watch list.  I will keep an eye out.  Can you post a picture of the loose connection you are referring to? It might be of some help.

Craig R