I've recently bought a subtle scooter for my youngest son, it has an old style threaded headset. It has been a while since I've used one and I need to tighten it. I no longer have the right spanner for the job, but loathed to buy a tool just for this. Are there any other tools or techniques I can use to tighten it up? No problem on the upper nut, just nothing thin enough to hold the upper race in place while I tighten the top nut.