Playstation Optimus / Sega Genesis Megatron

Got these guys recently -- very cool.
For anyone who has them, have you had any difficulty getting Optimus into PS mode? Both figures require a lot of precision transforming, but whereas my Megatron came together cleanly, I can't quite push the lower half of Optimus flush with the upper. When I do, it feels like something's resisting it and at risk of breaking. Anyone else find this? Maybe I'm missing some small detail of transformation...
For anyone who has them, have you had any difficulty getting Optimus into PS mode? Both figures require a lot of precision transforming, but whereas my Megatron came together cleanly, I can't quite push the lower half of Optimus flush with the upper. When I do, it feels like something's resisting it and at risk of breaking. Anyone else find this? Maybe I'm missing some small detail of transformation...