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They're not really as solid as the other seekers though, mainly due to the different chest transformation.
On the original seekers sometimes the side panels on the chest would pop off when moving the arms, so on the Coneheads they actually added these little taps to the front chest panels to hold them down. That would pretty much solve the problem for the Seekers, but on the Coneheads that doesn't really do much because without the jet nosecones filling the torso and having the side panels tab into them, those side panels can now collapse inwards which is super annoying.
It's an easy fix with the floor polish though. Just get a drop of the stuff inside that shoulder part so that it takes more force to rotate the shoulder than it does to pose the arm and it's fine. Makes turning the front chest panels really fucking hard though but thankfully it's not necessary to turn them for the Conehead's transformation. I don't think I'd put any floor polish in the Seeker's shoulders since you do need to turn those front panels to transform them.
They didn't do anything about the wobbly foot problem either though, which I honestly thought was more annoying than the side panels. At least still a quick fix like it was on the Seekers.