I have an old 1930 9" South Bend that has the original gits headstock oilers on the bearing caps for oiling the headstock spindle bearings. I know that this is oil gravity feed that runs through without any wicks etc. The existing gits oilers are threaded to what I believe is 1/16 Pipe thread (~5/16"/32tpi),the gits headstock oiler actually has 32tpi. The existing threaded hole in the bearing cap is almost the same size as 5/16" NF thread. Okay now comes the fun part. I purchased 2 gits brass drip oilers but unfortunately they are 1/4" pipe. I have found brass bell reducers from 1/4" pipe to 1/8" pipe but try and find anything in the 1/16"pipe is impossible. My question is can I drill and retap the bearing caps to 1/8" pipe without weaking the bearing cap??? The difference is very small but it is a larger hole. It looks like you don't have to drill and tap very deep, maybe 5/15", but I don't want to mess up the bearing caps.
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