Join Date: May 2009
Location: Prevezanian Riviera
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This is probably late for you but for others with similar problems this may help.
If you pressurize it enough, given all gas and fumes are out, to create a force behind the surface but not enough to push out other areas, and knocking with a mallet on the right spot it will pop out. The trick is to knock on an adjacent area next to it, especially if there is a kink you hit right on the kink like trying to push it in. By repeating those shocks to it can make it pop out. If not, and this is hard on the RC as there is just a little space under the cap, bend a thick wire or pipe with a bulby kind of weight at the end and knock it from the inside with possibly some kind of suction from the outside. The third and least recommended method is to drill a tiny hole and use a screw pulling hammer on it. This is something bodyshops use to pull out dents. It is a 2' rod with a sliding weight on it and a screw attached to the end. You screw it in and push the weight out and when it reaches the end it pulls the screw with the panel out. Good luck epoxying the hole so it will not leak again!
The RC tank, may seem heavy but it is made out of thin soft steel and it pops back into shape easier than others, don't ask how I know!
A good thing about vacuum is that it is eaven pressure everywhere, so the weakest part caved in. This does not mean it is the weakest part now, as the force is on the opposite direction and the shape has changed.
Last edited by ZeroGara; 01-11-2011 at 03:27 PM.