Hello Alex.

MY 1949 Scott is fitted with a pilgrim pump that has lock nuts on the adjusters. I fitted a pair of Gerry Howards steel end cam plates in about 1983, set the adjusters, locked up the lock nuts and have not touched it since.
The main trouble with the pumps is that over the years they have been stripped down that many times, mostly out of curiosity,as I did in my youth with my first Scott,that the threads strip. I have fitted 1/4BSP nipples through side of the crancase so that I can remove the crancase door complete with pump without disconnecting the pipes at the pump.
Gerry Howard used to convert pilggrims to drip feed with no movig parts and then use petrol oil to lubricate the top end. I think Ged Rumble wrote an article in Yowl a few years ago explaining how it is done. It is probably in technicalities. If the movin parts on your pump are U/S why not consider this option? The pump must be the most lubricated part on the Scott so should last for ever so long as the monkey metal case and end cams dont give up.
Best wishes Ted Robinson.