Re: 1976 Ted Williams 15HP
Here is what I do,
go to sear parts direct
http://www.searspartsdirect.com/partsdirect/brands/Craftsman-Parts plug in my model number and then take model search from the drop down menu, look at the diagrams for your unit, take down the parts numbers ( same as Eska;s ) in most case, most sears numbers are NLA and Sears is a costly shipper.
Then call CPC, you will get Diann or Vern, tell them what you got and what you need and maybe tell them where you heard about them

if you want to. Do not ask for technical support, ie How too's...have your 217-xxxx model number or Eska model no. in hand, they just sell parts because CPC owns what is left of Eska stock Rupp and a few other name brands from years gone bye and still make some OE hgh demand parts fresh,..as a plus there parts are usally nice and fresh anyway and have not been handled by 6 people before you....lol
The lower is simple, just lay it out in order...search for the little pins to diassemble it completely if you want or need to...other wise the only trick is try and catch the fork when you re install and never try pulling it in to much with the bolts....I use permatex Hylomar on my, big O ring seal.
I have a 1973 15hp twin Ted Williams side pumper with about 25hrs or less on it, my shifter boot looks brand new too but leaks when layed prop down..although my oil was water free this fall when I changed it, I did replace the drive shaft seal and retainer. mine had its original gear lube in it and it looked brand new

a rare Barn find, the hood was so nice I keep it in my bed room....lol
PS , you can buy a shop manual for 30+$, but the sear diagrams are plenty easy to see how thing go together