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Step 6Drill holes for Headset (HS) cups
Drill a 1/4 inch pilot hole (using a foot long 1/4" drill bit) for the HS at desired head angle.
Use another hole saw that fits the OD of your HS cup's inner sleeve to make 1/2" deep cup support holes like you did for the BB. Line the hole saw up with the 1/4" pilot hole. Drill at the angle that matches your head angle to the beam so the HS cups will sit securely after wood is chiseled from hole. Drill both top and bottom HS support hole saw cuts. Now you can use a spade bit large enough to match your steerer tube OD to drill the head hole all the way through following the pilot hole. I usually drill half way from each side.
Use another hole saw that fits the OD of your HS cup's inner sleeve to make 1/2" deep cup support holes like you did for the BB. Line the hole saw up with the 1/4" pilot hole. Drill at the angle that matches your head angle to the beam so the HS cups will sit securely after wood is chiseled from hole. Drill both top and bottom HS support hole saw cuts. Now you can use a spade bit large enough to match your steerer tube OD to drill the head hole all the way through following the pilot hole. I usually drill half way from each side.
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