The solenoid(s) mounted on the end of the compressor activates the loader mechanism, but the puter' will not allow it to operate under quite a few conditions, such as "Hi-Suction pressure over-ride" along with a few other items that will inhibit loading until such time the puter' thinks it is safe to do so. Mounting the wave springs under the suction valve is much more difficult than flopping the discharge valve into its position in it's cage. You need something to hold the suction valve in it's correct position whilst' you bolt her down. Most mechanics I know use the metal banding used to strap materials to a pallet, cut in 2-3" strips and bent into a "C" shape and placed over the suction valve assembly in 3-4 places. Don't forget to remove the strips after bolting it down.
Good luck.....Ya' gonna' need it..
Ain't "None" of us as smart as "All" of us..