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On those it makes no difference as long as they don’t slip. more the same with plate types, grease going very gummy isn’t good, I sort out car cone and plate clutches, some are dry others are wet, however the bit in-between can cause thousands of pounds damage, this is because the know it alls change the material as is very critical, some leather clutches can have a modern material used from a conveyor belt and works dry, where the leather needs treating a few times in 60 plus years. you need a very deep pocket to put things right.
I think it was a 350 that was baptised for a few days, with age grease was dry and add water it had locked up the clutch, I can’t remember, but to preserve the pulley wheel as hadn’t be moved in years, had to remove part of the flange on the splined hub with a die grinder to be able in getting at the cir clip it then was able to be taken apart, once apart removed the remaining flange and used a thick washer I believe the spring sat on it, worked a treat, only part needed was a condenser coil was still ok.