How to open the side hole on a Hammond?

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Anybody have a trick for knocking out the hole in the end bell of a Hammond tranny without taking the transformer (choked in this case) apart. I don't want to crack the varnish as this is a power supply choke and subject to buzz. Obviouisly I don't want to butcher up the end bell either.
I hate those silly knockouts but since my choke will be inside the chassis, I could actually use the side hole.
Alternative is just mount the choke on top of 1/4-20 nuts used as spacers!

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Kimber Kable

Topic - How to open the side hole on a Hammond? - Gusser 10:55:35 08/14/06 (1)

Try mounting them on rubber bushings for mecanical isolation... - SomeJoe 07:03:19 08/15/06 (0)

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