Aluminum bronze often has a similar finish but is 'whiter'/not as brassy yellow as 660 and being tough to machine is also a good indication it's not 660, if your tool is not sharp, it will just rub if your machine isn't rigid.Brian:
Your stick of bronze appears (to me) to be 660 "bearing bronze". I say that because it looks to have that spiral greyish mark the length of it on the outside.
See HMEM will be having a software update later today Post #8 this will anwser you problemI had the HMEM app on my android phone. It stopped working also. I deleted it thinking I would reinstall it and solve the problem. I can't find the app in the app store now. Wondering what has happened??