I use heavy clear flexible plastic. Like the heavy stuff they sell for drop-cloths or vapor barriers at the Hardware Centers. Draw your pattern with sharpie or pen and cut with x-acto or scissors. You can pull it around the plug pretty good.
If you have a woodburning tool witht he replaceeable heads, you can probab;y find a ehad that looks like an xacto knife blade. The blade heats up and makes cuttling your (plastic) stencil material like a hot knife through butter
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