You can t do that with vinyl corner pieces.
How to replace corner piece of vinyl siding.
Install 1 2 inch 12 7 mm foam sheathing strips on both sides of each corner then install your corner siding pieces to these strips.
Vinyl siding corners are no exception.
Overlap the flashing onto the row of siding just below the window.
Step 1 slide the vinyl siding removal tool just under the bottom lip of the uppermost piece of vinyl siding and pry gently upwards.
With damaged wood corner pieces you simply remove the damaged piece and replace it with a new one.
The corner posts should run from 3 4 inch 1 9 cm below the bottom of the starter strip to just beneath the eaves after the soffit pieces have been installed.
You may want to wait for a warm day when the siding will be softer and more pliable.
Be careful because older siding can become brittle.
Replacing vinyl siding corners requires the loosening of the siding nearest the corner before you can remove and attach the new corner to the home.