We bought a few ARO tools during the years I worked for Ford. My guess is the distributor that supplied these to DeLorean re-geared them with gears from another tool to achieve the desired speed. Aro made everything from air feed drills to air logic controls. The company has changed ownership a few times since 1981 and the parent company now has moved ARO from it's old home town of Bryan, Ohio. I'm not sure where they're located now. Many times we'd have a specific need for something not offered in catalogs and the local distributor would modify a tool and stamp something that would signify to us and the distributor what was changed. Actually any air tool with a chuck capable of holding the flap sander head could be used. Just reducing the air pressure to produce the desired RPM's is all that's necessary. High speeds will produce a too smooth, too shinny surface and too slow will produce the opposite. It just takes some experimenting. Bruce Benson > My DeLorean dealer original ARO unit is marked > Model# 8067E1S Serial# 4845F81 RPM 1000 > > The "S" on the Model# was struck harder and the 1000 on the RPM looks like > it was struck over the number 4500. > > My guess would be that the "S" was for special, and the slower RPM was what > was Special. To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/