Wing-back Davie returns to the club having played under Rudy Funk, and joins from this weekend’s opponents Matlock Town.
He has also previously played for fellow EVO-STIK League Premier Division clubs Gainsborough Trinity and North Ferriby United.
Williamson, 22, becomes the third player to move to the Seadogs from North Ferriby this season, following in the footsteps of Luke Lofts and Jamie Forrester.
The left-back was North Ferriby’s Bowland Brewery Player of the Month for September, and goes straight in to Steve Kittrick’s squad for the trip to Matlock on Saturday.
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