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| Just an fyi that our Thompson closing wheels for the 50-series drills have a truly durable bearing and shield configuration, and come with our 5-year warranty on the bearing.
http://www.exapta.com/products/thompson_wheels.html
No need to change the arm this way. Excellent furrow closing. I know of several customers who have reported running 20,000+ acres on Thompson bearing-type wheels on 50-series air drills without a single bearing failure in the T-whls. In one case, the drill wasn't shedded over the 6+ yrs either.
best regards,
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750 no-till drill
