Greetings folks (looks for a few familiar faces here) I have a slew of older TFs that I'd like to share with my son. They have been on display on my shelf in various poses for several years and I've found that the joints are stiff.. stiff to the point where I'm afraid to force them as something may break. These joints are ones that normally click when transformed. We're talking mostly G1 stuff here. When I say `normally click`, I'm thinking like the legs on Powermaster Optimus Prime's Trailer. I understand WD40 is a no no. But I heard Silicone based sprays are okay. Does anyone else have suggestions or experience with this? Just get a can of air? Force em (I hope not..)? Thanks!