Starter Solenoid

["Myron Ware" <cmw@domain.elided>]

Hi all,
  A recent problem has manifested itself and it was  making my 
starter a hit-or-miss item.  When it first happened, turning the key 
to the start position caused the ammeter to show a large discharge, 
but the starter motor didn't engage.  Tapping the solendoid with a 
wrench a few times worked to let it engage.  I took the solenoid off 
this afternoon and cleaned the contacts and flipped the big washer 
over inside of the solenoid cap (the top of the washer was very 
pitted).  After reinstalling and re-crimping new connectors on the S 
and R terminal wires, I now get a big fat nothing when turning the 
key to start. :(  The ammeter barely even moves to the discharge side 
of the guage.  Leaving the key in the Run position, I used a 
screwdriver to connect the R and S terminals, but still got nothing 
(that is the way to' hot wire' it, right?)  This is a starter on a 
4-196 out of a '70 800.  I believe I remember seeing a Delco stamp on 
the starter motor.  Can the solenoids be purchased without the 
starter motor?  Is there some other helpful hint I can apply to save 
having to buy a new solenoid/starter?  Any part numbers for 
replacements?  Thanks for any info,
Myron