mschwartz, If you locate a place to get information on Killefer products please post the site. I have two Killefer tool carriers that are about D2 or D4 size and cant find any info on them. The slightly larger one is a John Deere Killefer. I did learn that John Deere bought out Killefer at some point and just added their name to Killefer. Thanks, Grant.
D2Fred started a thread about rebuilding a Killefer offset disc on this board , a year and a half ago (it could be 2 1/2 years). In that thread we end up pages long with a lot of Killefer sales literature and other bits.