I bought a Great Plains drill with the seed lock wheels. Spent the time and money and rebuilt the wheels with new bearings and bolt and spring 44 of them. First year I started having trouble with wheels locking up with dirt and sand wore flat spots on some wheels. Took  them off for next year an put. Ketons on. just have to be careful backing into corners  to not let drill down and bend the seed locks. SAVE YOUR TIME AND MONEY AND Buy KETONS