Jack Friend fired the Pilgrims into an 11th minute lead, only for goals from Mitch Husbands and Charlie Dawes to turn the tide in Worksop's favour. Jamie McGhee restored parity in the 50th minute.
United included under-21s players Jason Alexander and Jai Lyons from the start, alongside youth team full-back Jack McCallum and trialist Kingsley Ogbodo.
PIC: Chris Etchells.