The following is a report on modifying a John Deere 9410 combine for plot harvest by adding a HarvestMaster Model 800. The modification was done at the Iowa State University Ag Engineering/Agronomy Farm in the Ag Engineering shop. The decision to modify this combine was to replace a John Deere 4420 combine that had previously served as the plot harvest combine. Parts were becoming hard to find for the JD 4420, and the research farm currently owned a JD 9410. Parts should be available for several more years.