A WITHERING third-quarter burst was the catalyst for Swifts' third elimination final win in as many years.
The Baggies struggled to make the most of their opportunities in the first half but got rolling after the long break to boot seven goals to opponent Harrow-Balmoral's three.
The team defied a long road-trip, wet weather and the unavailability of star players Tom Ruggles and Ben Fox to win.
They will now play for a place in their third consecutive preliminary final against Edenhope-Apsley this weekend.
The game started at a frenetic pace, with the first quarter a lightning fast in a match-up between two sides who generate a lot of quick ball movement from the half-back line.
The Baggies put three quick goals on the board in quick succession and looked as if they might blow Harrow-Balmoral away before the Roos dug their heel in.
Coach Brent Forsyth stood up for his side and kept the team from losing its cool.
Forward targets Josh Vickery and Damian Van Someren looked consistently threatening while ruckman Mick Phelan took a strong grab to kick the team's first goal.
While it never rained heavily, a steady stream of sleet dampened conditions underfoot just enough to make it hard for both teams after the opening 15 minutes.
Scoring opportunities were scarce in the second term, with the Roos posting the only goal through Brent Penny.
The sun made an unexpected appearance at half time and the Baggies seemed to respond to it, kicking the first three goals of the second half in rapid succession.
This time there was no Harrow-Balmoral fightback, as Isaac Rathgeber, Zach Salmi, Jake Goodes, Damon Folkes, Jeremy Joiner and Nathan Ringin all kicked goals.
The fourth quarter was a formality, with the two sides trading scores before the final siren.
Swifts co-coach Ben Martin said he asked for a bigger effort from his players at half-time and got it.
"The sun came out and gave us a bit of a lift - it was drier and we managed to kick some important goals," he said.
"From the first time we played them at home to now, they're a much improved side and Brent Forsyth has done a good job with his boys."
Martin said this weekend's match-up with Edenhope-Apsley held no fears for his team.
Ricky Whitehead and Isaac Rathgeber were outstanding all day for Swifts and arguably the two best players afield.
Tim Lillis also performed well in a run-with role on Roos coach Brent Forsyth after quarter time.Joiner, Folkes and Hamilton gave the team focus up forward which they have sorely lacked in recent weeks.
For the Roos, Will Plush showed why he is respected by his team-mates with a tireless effort and the defenders continued to back themselves when running out of the back line.
Brent Penny stood out in the forward line with four goals and several impressive marks.
Forsyth said his team was definitely not disgraced in defeat and could build on its unexpected finals appearance next season.
"It's hard to put into perspective," he said.
"Obviously we're disappointed with the result, but that being said, we didn't want to go out without putting up a fight and I think we achieved that.
"I think everyone even outside the club is starting to realise we're going places."