Help to Egg Shape

Hi congueros
I need some help because I would correct the egg shape of an very old Valje 10" quinto.
I thought to wet a little bit the wood and put on a round circle and force a step by step towards regular round, but I am afraid that wet can open staves and create more problem than I have now.
I would correct this problem before put on a new skin.
What is the best way to get back to a round shape without damage the drum ?
It is possible?
Thank in advance to all can give me an advice.
Ciao
I need some help because I would correct the egg shape of an very old Valje 10" quinto.
I thought to wet a little bit the wood and put on a round circle and force a step by step towards regular round, but I am afraid that wet can open staves and create more problem than I have now.
I would correct this problem before put on a new skin.
What is the best way to get back to a round shape without damage the drum ?
It is possible?
Thank in advance to all can give me an advice.
Ciao