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Manx Genealogy

Thomas Casement 1871 Census

Can someone help please.
I found THOMAS CASEMENT in BRIAN LAWSON's 1871 census index. Age 22 in BRIDE 5773 0 2.
But I have been unable to find the actual census document in ANCESTORY. I've tried Brian Lawson's reference and a number of other spellings of CASEMENT, but no luck.
I would like to have the DOB, where born info, occupation and the address in 1871, plus any other people that might be related to him at the same address.
I would be extremely interested in any positive result and how it was achieved.