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3 comments
Has it got an FSA Compressor Adjuster? They are for carbon steerer tubes, where a star nut might bite into the carbon fibre and weaken it.
The inner hex bolt expands the bung, so that it grips the walls of the steerer tube. If you loosen the inner bolt, the bung may drop further down the steerer tube, and be difficult to get out!
The outer hole fits a larger hex key, and is used to pre-load the headset bearings before the bolts on the stem are tightened. I find adjusting the pre-load harder with these than with the usual bolt threaded through a star nut.
Brill, cheers
Thats just how it should be. There is no plug or anything to sit above it
If you have a local hardware store. Pop in and see if you can get something like this
http://www.ebolt.co.uk/plastic-allen-screw-cap-cover---m8---pack-20-blac...
Or a bling one
http://www.rainbowbmw.com/wshop/index.php?route=product/product&product_...
That'll keep the crap out