Roto-zip might be you answer
this post was submitted on 22 Feb 2024
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I believe this is the way. Yay, new tool day!
Roto-zip could work well like the other poster said. If you don't have access to one, you can also use the abrasive sanding bits for the dremel, you may chew through a couple, but they work in a pinch.
Go get a diamond hole bit and use a coke bottle full of water with a hole poked in the top to cool and lube it. Use a drill instead of a dremel. You will likely chip the fiberglass (I'm assuming that's what you think is plastic) if you try with a rotozip bit.
Alas, this won't work because the stem is in the way. Thanks for the recommendation, though!
How long is the stem? You can get deep hole saws that may clear it.