Bought a used FT 897 on ebay, noticed the VFO knob was loose, in fact it pulled off like in this video. Has anyone run into this before - do I need a new encoder, or vfo knob (don't think so), or do I need to disassemble the VFO and reassemble it and everything will be fine (hope so)? I cannot tell which part/assembly the shaft is part of, I just know that someone did not unscrew the set screw from the vfo. When you do that, you can remove the vfo from the shaft. Help appreciated!