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Alan, Perfectly normal to have to adjust the clutch once a year or even more frequently depending on how much the tractor is used. I found that there was not much adjustment I could do before the castle-nuts would get too far back from the cotter pins. I seem to recall that there are two cotter pin holes in each of the three adjusting bolts. I used a thin washer under each nut to back within range. When you do adjust the clutch remember that a little movement on each nut goes a long way. Just turn them one or two flats at a time and of course adjust tension on all three nuts equally. This should help to reduce any jerkiness when engaging the clutch. Now is a good time to check the adjustment of the pulley brake. The brake pad should contact the belt pulley immediately after pulling the clutch "out". If the pulley brake is too loose you may actually be able to pull the clutch handle back far enough that it causes the clutch to being to engage again. Best of luck,
John
1953 Model 50.
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