Ben Bridle-Card again earned deserved plaudits after another impressive display against mid-table rivals.
The Sevenoaks Town goalkeeper produced a superb second half double-save to deny Three Bridges, but the host’s penalty woes returned to haunt them, costing them the chance of success and topping the 40-point mark.
Greenwich Borough’s 1-1 draw at champions-elect Cray Wanderers on Sunday means Oaks are safe - and certain of playing Bostik League South East again next.
Bridle-Card was Sevenoaks Sports Man-of-the-Match for the second successive home game foiling Bridges with two more fine saves from winger Andrew Sesay.
Oaks won the corner count 18-6 - including five in the opening 12 minutes.
Dan Parkinson’s free-kick was pushed against the post by Bridges keeper James Shaw, and Lauris Chin’s effort deflected wide.
Bridges looked lively, Bridle-Card pushing away Abby Akanbi’s low shot under pressure, then blocking another effort from the same player, with Olu Oluwantimihelin’s follow-up ruled out for offside.
Oaks went close to breaking the deadlock after 51 minutes, Jack Miles heading wide after skipper Tom Ripley had flicked on Parkinson’s free-kick.
Oaks best chance came nine minutes later when Bridges defender Lee Hall handled in the area.
With usual penalty taker Frankie Sawyer on the bench after being ill during the week, Everett took responsibility, only to see Shaw dive to his right to push it away.
Dean Gunner then cleared from inside his own six-yard box after Adrian Stone had touched on Parkinson’s corner.
Bridle-Card’s acrobatics kept Oaks level before Akambi drilled another effort wide of the far post late on.
No goals but entertaining all the same.