Electing to chime in on this thread in particular because of those who have already chimed in **AND** because OP has created essentially the same post elsewhere on this forum.
In light of the aforementioned, see response here:
https://forum.audiogon.com/discussions/rca-shorting-plugs
In light of the aforementioned, see response here:
https://forum.audiogon.com/discussions/rca-shorting-plugs