Old ageing 61 not a problem, MGB, one pump, never have known of one to fail, okay had to change one several years ago for borderlne pressure, but normally not a problem.
S61 Hyd pumps, okay as long as both the internal and external splines were lubed.
Where they screwed up on the S76 Hyd pumps was when they went to the non-metallic splines, problem was that they forgot to tell the operators that the internal splines on the pump were still steel splines, smaller diameter as well so didn't last too long without grease.
Would like to know the reason why they go with the steel/ plastic type, as to plastic/ plastic obviously not for ease of maintenance, its a bit more difficult to lube the inner splines, is it a case of the Pump manufacturers going with steel ????