Um....Beyond "finagle," all I could come up with was "Kegel" - as in the Kegels exercises women do to keep the floor of the vagina toned. And I don't think there's ever just one Kegel - I think the exercises are referred to as "Kegels."

Come to think of it, the word might even be pronounced "Keegels" - in which case it doesn't even approximately rhyme with "bagel."

In short: I don't know!

If you can't see the bright side, polish the dull side.