The best way to do it to avoid damage to the crystal is to use a case back presser which you can find on ebay at reasonable cost. Be sure to replace the rubber gasket too - even if it looks OK - to ensure water resistance. Once compressed a gasket should not be reused.
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The best way to do it to avoid damage to the crystal is to use a case back presser which you can find on ebay at reasonable cost. Be sure to replace the rubber gasket too - even if it looks OK - to ensure water resistance. Once compressed a gasket should not be reused.