sr4 foam removal strategies

[tom russell]

recently bought a sr4 and the bung has came out the back so i have found out that it is full of foam (blocking up the flooding hulll) just wondering as the whole is only about 5 iches in diamter right at the back of the hull how would i remove the foam as it might make me a little heavier especially if it ends up absorbing water? thanks guys
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tom

[HUMBER P4VWL]

I have no experience but as an idea is there a chemical that would dissolve the foam but not the internals?

[spartacus]

Any indication how far the foam goes back? I doubt it goes the whole length of the boat. What about a disc hole cutting tool on a threaded rod connected to a drill. Bit Heath Robinson, but on slow setting I'm sure you'd make progress. Bow would need to be raised, etc.