Power tube spacer matching

[Slapp]

I understand power tube spacers come in about 5 different lengths. What are the variables in a marker that require so many different lengths in power tube spacers? How do you determine the correct length to use in your marker?

[PyRo]

Pretty much by trian and error. The need for larger or smaller spacers can be determined by a specific problem you are having. If everything works ok then leave it alone. Tolerances sometimes vary slightly from gun to gun, most work with .225 spacers, but some need bigger or smaller.