Do you have access to a grinder?
Yes.
Would you suggest cutting a channel, then tapping out the waist?
Is there a trick to maintaining the correct depth?
I use a blunt multi tool blade instead of a grinder. I have a depth stop for my multi tool but it's pretty variable when you take into account the blade width and angle etc.
You can alter the relative position of the dust guard, and use that as a depth gauge.
@hugo7 started
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Do you have access to a grinder?