I use a basin nut wrench. They are plumbing tools made to tighten or remove 
 the drain fittings under sinks. They are large, adjustable and not very  
expensive. They are made from castings and not very strong but these are not  
high torque tasks we are talking about here. I also use mine to adjust and 
lock  the shaft seals. 
 
Andy Dalzell
C-27 #6298, Tardis
Sandusky Bay, Ohio

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