Macclesfield continued to look impressive as an attacking force and were rewarded with a 31st minute goal from a free-kick by Welch.
Harriers were now chasing the game in a bid to keep their unbeaten run going but were struggling to use their possession effectively.
But the impressive Stamps did burst through from defence on 44 minutes after swapping passes with Shilton but his left-foot drive flew into the side netting. Scott Stamps
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