Thanks to all for their suggestions and to George for the solution I implemented. I did like Jamie's suggestion, but with the frog having so little movement when placed in the body, it would have been a long difficult process to work the high spots down.
Just goes to show there is more than one way of doing most things.
Now that you know how much adjustment is needed, removing a touch of metal from the frog shouldn't take that long. Otherwise, you know just how much foil is needed to fill the gap.
Glad to hear you got it working.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)