I hate mud pumps. The first one I worked on was in the forward hold of the Glomar II. We had to change the liners (in 68) with no air tuggers, and about 110 degree heat in that compartment.
The first one I worked on was a duplex without air hoists or pneumatic wrenches.
There's a lot of difference between changing 6" liners in a duplex and changing them on a triplex!