Low was not handling the ball safely and he was beaten by a neat McCallum shot, but was saved by an off-side decision.
It was all Lynn early in the second half. Durant was inches away from reaching McCallum's centre and Rudd had a shot cleared of the line by Spooner. The third goal came when McCallum beat Thetford's offside trap and put Rudd on his own to hammer a well-placed shot past Low.
Thetford came back in the next minute when Daniels toe-punted in from a goal-mouth scramble and in the 80th minute Franklin cracked in a tremendous shot against the bar.
It was all a bit too easy for the Linnets and not much of a test for their new look formation which had player-manager Frank Wignall at centre half, McCallum back in mid-field and Buster McNeil getting a chance at full-back which he took coolly Thetford: Low, Spooner, Muttock, James, Daniels, Cox, Cooper, McLinton, Poole (sub Sayer 67 mins), Cunningham, Franklin.
Lynn: Steel, McNeil, Lindsay, Brooks, Wignall, Wright, Durant, McCallum, Rudd, Elliot (sub Massingham 60 mins), Clarke.
Report by permission of the Lynn News