The possum hollow bore guides I have do not have a solvent port, they sell a separate insert that can be slotted into the bore guides:
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Possum Hollow Solvent Port 17 to 26 Cal Delrin
Possum Hollow Solvent Ports significantly enhance the performance of your bore guide by easing the solvent application process. They also reduce the...midwayusa.com
Not knocking your solution, that works well too, just as a heads up
I have the separate solvent ports on my earliest guides. They work better if you epoxy them in permanently.