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(ET) Mower Motors



I have 2 ET mowing decks, and 3 different types of motors on them!
 
One has 3 motors approximately 3.25 x 6.5" (above the deck measurements)
The other deck has 2 motors 4.5 x 5.25 " with small boxes on the side, and 1 motor 4.5 x 6.75" with no box on the side.
 
Due to the presence of repainting, I think the second deck was substantially repaired and has a "mix and match" motor set since none of the pictures of ETs I've seen has different motors on a single deck.
 
Question:  Is one type of motor better than the others?  If so, which?  Historically, what's the progesssion of sizes?  Is there any engineering problem with my "mix and match" set - its worked OK for years.
 
Also, one deck has a locator arm (the spring and piston assembly) that is in pieces.  While I seem to have the parts, there is no obvious way to keep the shaft/piston from simply falling out of the cylinder assembly since there seems to be no retainer, and no obvious way to get to one internally.  I have no diagrams or pictures in my archives that might be of help - can anyone tell me how to put these parts back together again?
 
Pieter Litchfield
new e-mail is: plitch attglobal net