The left (male connector) half of the sternum strap on my Aerostar disappeared somewhere on a train in the UK. I'm now in South Africa, moving around, and can't do the obvious (order the one with the whistle as a replacement) until I return home. Any suggestions for a temporary work-around in the meanwhile, that doesn't involve use of chewing gum? Without the sternum strap, the fully-loaded bag does tend to pull on my shoulder and even slip off. I'll survive without it, but a work-around might be nice.