California Pak rolling backpack telescoping handle stop replacement

I've designed a replacement for the stop / lock of the telescoping handle on the CALPAK rolling backpack. If you're a bit rough with it the little plastic slide can break and the handle will detach. To get to the broken part you need to remove the 3 screws under the top of the handle slide and the single screw at the bottom which will release the metal tube. Then if you gently pry out the top plastic spacer you can slide out the white piece in the picture. It will slide apart and you can reuse t