This tool can be useful in changing springs on Glock guide rods. It may fit other models as well depending on the diameter of the center hole in the model. It should be easily scaled up or down to change the size of the hole to meet your needs.

"Necessity is the mother of invention"
Benjamin Jowett

“GLOCK” is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.m.b.H.