I bought a length of flat aluminum from a hardware store when the strap for my Jardine fell off. I believe dimensions were around 1/16" thick, 1" wide and maybe 3' long if I remember correctly. Cost was ~$3. I posted a thread with photos around here somewhere. I think it actually looks better than the original strap.
Some people have also used a metal ruler for this.
In this photo I also wrapped the aluminum with 3M di-noc.