JohnBob,
You can counter sink the transducer with a router. I use a set like
http://amzn.com/B00012XC5C
That way I can use the inside of the hole as my guide and use a bearing that is
small enough to give me the width of cut that I want.
Be sure that you cut the counter sink slightly deeper and slightly wider than
the flange on the transducer and then back fill with epoxy so that the internal
grain of the glass, or the core isn't exposed.
Along the same lines as drilling out too big a hole for your through hull,
back filing it to protect the core and then redrilling for the right size.
JamesS/V Kristy 1971 C&C 39
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