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When you pull the waist up this little tab is sticking into the sides. So give the waist a little wiggle to get this side tabs out first then pull. It's tight but not as horrifying
Also on he broken crotch situation. You have to slide the hips forward. I would suggest pushing on his arse over the hips. That famous broken crotch piece looks like the dude tried to do one hip joint at a time pulling on the hip.
Aside from that not a bad transformation. Easier than G1 megs and similar to original toy.