Today, almost all bulk metal materials that are referred to loosely as "aluminium," are actually alloys
this is a quote from wilkspedia

Plain (pure) aluminum is too soft for most things. Even the skins on airliners are not pure aluminum. They MAY be an alloy base with an aluminum layer on top. It's called Alclad.

Alclad:laminated metal produced in sheets composed of a Duralumin (q.v.) core and outer layers of aluminum.

Duralumin:strong, hard, lightweight alloy of aluminum, widely used in aircraft construction, discovered and patented in 1910 by Alfred Wilm, a German metallurgist; it was originally made only at Düren in Germany. The original composition has been varied for particular applications; it may contain about 3 or 4 percent copper, 1/2 to 1 percent manganese, 1/2 to 1 1/2 percent magnesium

aircraft grade aluminum (7075 T-6) is non ferrous as is 6061 regardless of what off the wall name you wish to call them.

kc

And most likely so are many other pieces of "aluminum" that one would find on a plane. Bottom line, avoid metal to metal contact.

i hope nobody ever lets that slip out, BVM and the other MFGs would loose billions in sales of their accessories such as their retract systems and all the law suites filed because their accessories caused radio interference...

kc

Ok. Great info. Not sure where this leaves me. I ran the plane up today. On the bench, no glitching. After the day, I took apart the assembly, coated in white lith grease and put back together. So, I have a wheel colar rubbing up agaist the alum plate. Does not seem to do anything.

Anyone think this is suicide?

G