Music/Model/Piano wire questions

Special Circumstances

OK, I know nothing about musical instruments.

Online research suggests a handy way to make some precision electrical probes is to use piano wire or similar. Sometimes used by hobbyists for models. Basically I want to get some fine gauge flexible but strong/springy metal. Strong enough to force fast insulation on an electrical connector but not too thick.

Anecdotal evidence suggests piano wire may be hard to come by, used only by professionals, but that there may be equivalent guitar strings?
A single core wire rather than a wound string made of smaller strands - I don't know if this even applies to metal guitar strings, I guess it doesn't apply to piano wire.

I estimate I need something in the following ballpark
SWG Inch mm
22 0.028 0.711
23 0.024 0.610
24 0.022 0.559
25 0.020 0.5080

Sound like something I can buy off the shelf in an average musical instrument shop in Ireland? If so, what should I ask for to shortcut the explaining and possible confusion. Ideas on cost of a single unit of wire?

Special Circumstances

OK, maybe I have a contender:

A single Plain Steel ball-end .026 (0.66mm) guitar string from D'Addario.


http://steamboatmusic.ie/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=1506&virtuemart_category_id=170&Itemid=625

Gaspode

I've loads of old strings lying around, you're welcome to them!

Special Circumstances

Down in Limerick so I'll swing by the local music shop, have a nose myself at the different types and see if I can avoid some of the awkward situations I've created for myself in the past.
Looks like a euro or two will sort me out for years. I just wasn't sure I would be able to find what I was looking for until I found that link above, never paid much attention to guitar strings.