Which preposition to use with mainstay

of Occurrences 41%

Redfern, the next man, had hardly taken his place at the wicket when a sharp click, the glitter of bails twirling in the air, and a Wraxby shout of "Well bowled!" announced his fate; while ten minutes later Rowland, one of the mainstays of the home team, was caught in a most provoking manner at cover-point.

for Occurrences 3%

At one end is a small gallery, used as the mainstay for the temporary orchestra, which is erected on festal occasions.

through Occurrences 2%

"Whatever you do, Jack, don't lose the fine courage that has been your mainstay through other troubles," Nellie said, as she laid a hand on his arm and looked steadfastly into the young air-pilot's face.

in Occurrences 1%

You have just lost an amiable companion who has been your mainstay in a foreign land.

Which preposition to use with  mainstay