I have heard that aluminium bronze is difficult to machine so I am wondering if possibly those pieces of brownish coloured wear strip I have might be aluminium bronze. You British chaps will note that I have spelt aluminium and coloured correctly! On occasion, I get brass castings that have a little speck of aluminium showing on them and frequently that is quite hard. The foundry moulds both brass and aluminium so sometimes a speck of aluminium will be hidden in the moulding sand and fuse with the casting. Jesse in cool damp, but not actually raining West Tennessee MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.