I use what is commonly called piano wire with a wad of thread and head cement on the end to hold the end of the tube. I bought the piano wire at a hobby shop that sells to the RC airplane crowd.
Don't try to cut piano wire with a diagonal cutting pliers though, its carbon content can put a notch in your pliers. There are two ways I cut the stuff. One with the abrasive wheel on my Dremel tool. The other way is to notch it with a file and snap it. In either case, wear a pair of goggles for eye protection.
Or in a pinch, you can use a small drill bit from a hardware store.
I buy my q-tips from the dollar store, or just raid a medicine cabinet or two!
Ed
" Fishermen, hunters, wood choppers, and others,
spending their lives in the fields and woods,
in a peculiar sense a part of Nature themselves,
are often in a more favorable mood for observing her,
in the intervals of their pursuits,
than philosophers or poets even,
who approach her with expectation."
Henry David Thoreau