You certainly can get a toothbar for a 4in1. See the pic of my toothbar on my 4in1. This toothbar was made by FCC Attachments. See link below.
<A target="_blank" HREF=http://www.ffcattachments.com/cdrom/buckets/BK12.htm>http://www.ffcattachments.com/cdrom/buckets/BK12.htm</A>
Regards,
Bob Ancar
Cambridge, NY