vertical play in chain ring spider

Hi,
I undid the bolts on my front chain rings to grease, but now I can move the chainrings up and down a few mm. How to I tighten them to the bottom bracket?
I undid the bolts on my front chain rings to grease, but now I can move the chainrings up and down a few mm. How to I tighten them to the bottom bracket?
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Parktools :?:SheldonBrown