I can't believe
How much oil is in that clutch, no wonder it wouldn't spin up!
Pete, the difference in the clutches to the best of my knowledge is that an impact style places full motor torque through the rollers to the tub, similar to what a Unimatic would do, you'll notice on that style that the motor ramps up slowly. The sure-spin, carries the full weight of getting the tub up to speed, the motor instantly comes to full speed along with the rollers, transmitting the power to the clutch, this type of setup is easier on the rollers as it places all the stress on the clutch.