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I read something about 5mm of spacers above and below the stem being necessary with carbon steerers. I'm using a Tester top cap which incorporates a 3mm spacer, so I was going to put 3mm below the stem
The 5mm on top suggestion arises from the fact that spacers thinner than that are rare (<spam>unless you go to Tester's Tuning Shop</spam>) and conventional top caps intrude a couple of mm into the spacer or stem. Just make sure the steerer is clear through the stem, anything over 2mm is just for later adjustment. 5mm under the stem comes from a couple of bike manufacturers who have come out against slammage, without providing any convincing evidence that a spacer between the stem and upper bearing collet really does anything useful to preserve the steerer.
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gbj_tester
Tractor repair centre indeed!
OK, I'll get a new bung (as much as I like hitting expensive things): are they all much of a muchness, or is there CTB approved one?
While you're here: I read something about 5mm of spacers above and below the stem being necessary with carbon steerers. I'm using a Tester top cap which incorporates a 3mm spacer, so I was going to put 3mm below the stem: death in the face or hugs all round?