Join Date: Mar 2003
Location: Fairbanks, Alaska
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When I replaced my BBD with a MC 2100 I used shorter studs. I just got standard studs from the hardware store and cut the fine thread end to the length needed. I am about 90% sure they were 3/8" diameter (if that is wrong they were 5/16"), fine thread on top and coarse on the bottom. They were definately common thread size though.
For what you are doing I would not use studs but instead use alan head bolts. Just drill a counter bore in the top of the adapter for the head and you should be good to go.
I will start using Metric only when the duodecimal system is adopted!!