Hammers defender Billy Walker broke the deadlock with a thumping header on the hour but the visitors were up against it when Jordan Cole conceded a penalty and saw red for denying Isaac Sedu a goalscoring opportunity.
But no sooner had Alex Pickering slammed home from 12 yards, Kemp’s men were awarded their own spot kick for handball which Dominic Allen gleefully tucked away.
However, just as Hamworthy seemed set for a creditable victory, Luke Walker scrambled home an agonising close-range leveller for the Jam Boys to leave Kemp crestfallen.
The County Ground manager told the Daily Echo: “It was a probably a fair result because our keeper Dan Ackerman played well and made two or three good saves, but we were frustrated with the manner in which we got pegged back.
“They took a long throw which seemed to bounce round the penalty area for an age before their lad toe-poked it home. We were so close.
“At 2-1, Russell Cook had a great chance which he put over the bar. If that had gone in they would have been dead and buried.
“With the effort and commitment the lads put in, it would have been nice to see it through to the end but it just wasn’t to be.”
Hammers: Ackerman, Penny, Cole, Walker, Haysom, Corby, Allen, Hester, Osborne (Webb, 65), Cook, Martin. Unused subs: Brian, Sturgess, Diaper, Thomas (g/k).