I have found that the IEC's contacts are recessed and barely make contact with the pins in the IEC socket. I have had good sucess by cutting about 1/16 inch of the end of the plug using a fine tooth hack saw.
I think the blu-tack is a great idea. It will help dampen the connection and I will try it.
I think the blu-tack is a great idea. It will help dampen the connection and I will try it.