[TR] TR3 brake caliper question.

[Angelo Graham]

Hello List:
Just have a question about repairing a stripped thread on a Girling 
caliper. I have the caliper that uses the triangular metal tabs to hold 
the pads in the caliper.
The top small 1/4" in. bolt hole that holds the bolt for the tab is 
stripped. I thought of opening the hole out to accept a 5/16" NF bolt, 
but not sure about this as the hole is close to the center line/split of 
the caliper. Any problems with opening this hole out?
The hole is not stripped too badly. Would it accept a 1/4" coarse tap? 
Even using a Heli-coil would require opening the hole out to at least 9/32".
Any experiences with this repair?
Thanks for any help with this.
Angelo Graham