I would not run the bias that low. Normally I set the bias on my Ref 110 around 63ma. I am not sure if my Ref 110 even came with a bias tool. My Classic 60 came with a red one which I still use.
The bias tool is nothing more than a plastic screwdriver. There is nothing special about it. I have a couple of them. You can get them at electronic parts stores. probably Ebay or Amazon would have them. My favorite has 2 size heads. A smaller head on one end and a little bit larger head on the other. I have only ever need the smaller head with ARC gear.. In a pinch you could even use a thin piece of plastic.