Yes sure, we can fix that up for you, I'll just ..
Check that it's not just a loose heel block...Rapid shanks are for when the existing shank is broken, bent or weak. Look for creases of the insole board on inside of shoes near front of heel block, and listen for crunchy sounds from broken shank when you wiggle and twist shoe while holding heel block.
So basically we are adding a metal plate under the insole and on top of the insole board, 4 little screws at the back from the inside, and 2 big screws towards the front from the outside. No need to remove old shank.
Notes - Mens shoes where the sole is snapped through.
Main Points
PZ1 4 at Back
SQ 2 at Front
Take your time and do each step well and it won’t take long or be difficult