[SEL] leather cups

[Andy Glines]

> My father used the following method  to make  new leathers for water pumps. 
>  I have made seals for a hydraulic jack using  this technique.   
> Take the upper part of an old leather boot.  Then cut out circle of leather 
>  (the diameter of the cup plus its  length).  Next take a scrap/piece of  
> wood and bore a hole which have a diameter of the cup plus twice the 
> thickness  of the leather.  Then make a wooden  peg the diameter of the cup.  Soak  
> the leather in water for about an hour.  Center the pre-cut circular piece  
> of leather over hole in the wood scrap and force the peg on top of leather  
> into the hole.  Let dry.  Now you will have a pre-formed leather  cup which 
> will fit into your oil can pump.   It may be necessary cut/punch a hole in  
> the pre-formed leather for the pump rod.  The oil (in the can) will  cause 
> to leather to expand and make a good seal. 
> Francis Maciel 
> Santa Maria, CA

> You might find that nitrile gives you better results, and you can get that from McMaster-Carr for a few bucks.
> 
> If you are dead-set on leather or some other non-standard material, A.C. DuPuydt is the place to go. 
> 
> Both are on the web.
> 
Thanks Francis.  I will use this method if I try to make new leathers.  I already have a sacrificial boot in the shop.  Rob, are you talking about nitrile sheet product or preformed cups?