Whanganui's Rachel Dickie and Tylee took shots which were blocked and away respectively, but Loren Mooney made sure HSHC B didn't get to clear with a good turnover.
The younger visiting team still kept their heads up and after a Aimee Croad shot missed, HSHC B got a penalty corner and Melissa Viviers made a perfect strike around the Whanganui wall to tie the scores.
The 1-1 scoreline didn't reflect Whanganui's territorial advantage, as they kept forcing turnovers, with Tylee and Skedgwell having shots that richoceted away, while Dickie received a penalty attempt in front but pushed it wide.
Pressure finally told when Melissa Goff got her penalty corner shot away and it flicked up off Keedle's foot and into the goal for 2-1 at halftime.
A Lucy Skedgwell run had Whanganui on attack in the third quarter, with Tylee working with Nicki Skedgwell but they just couldn't quite put it together.
Another Tylee shot was deflected, while Charlotte Baker had a long run and sent her pass up to Michelle Lowe, who had to leap high but couldn't bring it down.
The odds Whanganui would keep missing had to be decreasing, and Lowe finally made it work as she collected a better pass to bury it for 3-1.
Continuing to force midfield turnovers, Whanganui had another couple of penalty corner attempts, which were saved or deflected by Keedle, but the tide kept coming and the home side swung in from the right of the goal to Nicki Skedgwell and Lucky Wilbur, with Wilbur getting the score.
HSHC B had a couple of chances in the fourth quarter as Whanganui began to slow down, but the defenders held firm.
"We did it the hard way, had all the chances and all the possession," said Baylis.
"We were just way too soft in the attacking circle – we just wanted to push forward and say, 'here you go'."
As a team that doesn't formally practice due to the veterans playing social grade during the week, Baylis said they were lucky they have the experiance to play as a core group and then bring in their young players around that.
Whanganui's next game is against College Social in Palmerston North, while Tech College Old Boys come off their bye in the Manawatu Premier Men's grade to face Palmerston North Boys High at Gonville.