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@gbj_tester
I'm planning to make more of these in February, I'll make 2mm deep ones in common diameters (45/46/47/48) plus any special sizes ordered and paid for before manufacturing starts. To determine which size you need, refer to the instructions and diagram below.
Measure the head tube diameter at the top. Measure the depth - to do this, assemble the headset and stem and adjust the preload, then, without lifting the front wheel off the ground (which will tend to move the steerer and thereby mess up the precise position of the compression ring) measure the depth from the top of the compression ring ③ to the top of the head tube. From this dimension, subtract 0.3mm, which is the recommended clearance, to get the required internal depth of your bearing cover. If your result is less than 2mm, you'll want a 2mm deep cover and one or more 0.2mm shims on top of the compression ring. These shims can be found in most people's parts bin, if there aren't any in yours ask your LBS or friends.
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