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Combined with Crotch Assembly Part 1, this helps to give Combiner Wars Ultra Magnus a more G1 look.
Begin by snapping Crotch Assembly Part 2 into the main part of Part 1, using the diamond shaped pegs. You may want to apply glue to the edges of the diamond pegs and let it dry before proceeding. Do this for both the left and right sections.
Snap Crotch Assembly Part 1 over the legs. If you need help lining this up, you can disassemble Ultra Magnus' lower torso using a small Philips Head Screwdriver (I reommend one from an eyeglasses repair kit).
Snap the side flaps into place using the small circular pegs attached to Crotch Assembly 1. Glue is not recommended here as these need to remain mobile for articularion. If the fit is not tight, try using clear nail polish on the circular joints to provide more traction.