chase the shell BEFORE paint. If the tool binds and racks the threads.. silver can be added to repair.. Not that I have ever had this problem.. but just saves a paint job if something goes wrong. Also fit the chain stays in the shell ( if using lugs) so that there is minimal material protruding into the shell. This makes for a smooth tap cutting job to full depth. Otherwise the excess material will need to be removed so that the lead in of the taps will clear. DO NOT USE A GRINDING STONE!!! do the job with a file. Fragments of the grinding stone might embed into the steel. this will reak havok on any tap feed into the shell... HSS is fragile and if it sees ANY sort of stone fragments.. the tap will fracture and dull..
The best practice is to build it tight and not have to remove marterial!
Public service announcement over.
Photos..
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