Don't know how I missed this thread before but....
This is a old trick for sure but something that I just tried about a year ago for the first time myself. I did not bother with the boilding water I just drilled a hole right through the transformer and the glue on a 57 and a 58.....
Yes much better sounding. I use them for toms now, top only nice and meaty.
Worth the effort and by mistake I drilled right on through the side of the mic body on both mics, no I will not get them confused now.
Spend the $60 or $70 on Ebay, pick up a used one and give it a go (but don't say I told you so if you drill through your finger or something....).