Replacing generic RECEPTACLES

Hi @elizabeth. I saw your earlier post about Blu-Tack, I didn't realise that you spread the product over the entire duplex cover.
  What's your take on RFI leakage thru the AC receptacle; does this need to be treated? Or is vibration control the only aspect that needs to be addressed? A lot of folks are spending big money on carbon fiber receptacle covers.
Thanks.

I get that the Blu Tack is only on the backside, that's where I want to use damping material. 
So, I intend to stop vibration at the receptacles, but do you believe that this area also needs treatment for RFI?

I'm not going buy carbon fiber treated covers, but I'm still looking for an explanation of how RF can be generated or exist at the AC receptacle.
 

Thanks so much, Elizabeth, terrific explanation. Now it makes sense why you have the quartz crystals in different areas, and why so many tweaks are for sale to treat these same areas.
  I was aware of possible RFI being found in the obvious areas such as unshielded AC cable and transformers. The Crystals and similar tweaks to be used system-wide seemed unnecessary to me.
The Greenlee tool could be useful.
Thanks again.