Doug Winterburn wrote in news:4c0e4fb3$0$6342
:

One problem might be that the riser wasn't uniformly cut and is rather
irregular/jagged/bent.

That sounds like a problem for the Wonder Tool, the HF Multitool! Now to
get a version that'll run underwater...

Maybe it's serious enough to warrant purchasing the Fein.

Puckdropper
--
Never teach your apprentice everything you know.