We have a range of glazing wedges available, with various thickness.
It's recomended that you stop in to see us and pick up a bag of sample sizes or order one online and try them in your window using a detergent water mix in a spray bottle applicator.
The fit should be firm to tight (excesive force will lead to glass breakage!)
GLAZING WEDGE SAMPLES - are available - refer Glazing Wedge
You can also purchase a standard Glazing Tool