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Thanks for your thoughtful response.
Yes there is an end cap on the Yad which I will have to drill out.
As you suggested this hole will not be visible once the two pieces of
the Yad are soldered back together.
I also looked into the drift punches that you suggested. They are
not in the Sears Canadian catalogue, but I did find them in the US
catalogue. I am going to drop by a local Sears store and see if the
Canadian stores will bring them in
If I cannot easily get the drift punches, I have a number of
different mandrels and sections of tool steel that I can probably
reshape to help me do the job.