Well. This fix only works for Single Level circuit boards. Your speakers likely have these. If you're trying to fix a motherboard or any complicated board they are made up of multiple levels and THOSE you really cannot fix unless you're into X-Actoing up each level and somehow runnign foil across.
The trick you use is great for simple stuff. Like the guy who build the atari 2600 portable system. He cut up his 2600 mainboard and repositioned it all. Very clever.
http://www.classicgaming.com/vcsp/Vagabond03.htm