[sdiy] Am I crazy?

[Mark Rivera]

>> For good electrical contact, the pieces need to be pressed
>> together. In this case, pressure exists initially as the thumbtack
>> pierces through the copper tape. But copper is not elastic so the
>> pressure drops as soon as the hole is made.
> 
> Perhaps use braided sleeving (from shielded cables for instance) instead 
> of solid copper tape?
> If you apply some tension to the sleeving the wires would press against 
> the tack.

Desoldering braid might do the job.