Sigma 70 mm 2.8 macro lens cap problem.

First, thanks to all that replied, been gone over the week end. I found that a 77mm inside mount cap works perfectly. It snaps right inside the hood just as the original cap snaps into the lens, holds perfectly too. I found out by trying the cap that comes on the sigma 17-50 f2.8 so I order one from Amazon, about $5. Thanks again.
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Roy Martin