FSA Compressor Expander / Compression Plug and Top Cap - FSA Compression Plugs are top assemblies for carbon steerers. Replaces the traditional top cap assembly. Includes cap, bolt, and expander. Includes cap, bolt and expander Top assembly for carbon steerers replaces traditional top cap and star nut assembly.
The FSA compression plug is so more elegant than a star nut as you can remove it easily should you want to recut your steerer tube. This permits you you to cut the tube a little long at first to experiment so you know the exact length you need. Also, if you upgrade the fork you can remove it and re-use it. Anyone who has trouble installing this plug is out of their league for doing fork installations, it is simple but you need some mechanical aptitude. Getting it snug enough was easier if you use the T-handle type of allen wrench but not essential. I use these even on alloy steer tubes because they are removable and easy to install. PROS: Easy to remove, Easy To Install CONS: Star Nuts Are Free.
I hate star nuts, so I have tried a couple of alternatives. The others did not grip the steerer tube securely enough, so I couldn't get the headset tight enough, so I went back to star nuts. But I decided to give this one a shot before giving up on the idea completely.
It works just as well a star nut. And there's no star nut to go off-axis, or to interfere with cutting the steerer tube, or to get pushed down too far by accident, etc.
The only drawback is that it took some tinkering to find the sweet spot where it slides in but yet it grips the steerer just enough that you can tighten it. If too loose, it just spins when you try to snug it up. PROS: Never Goes Off-axis, Quality Construction, It Just Works CONS: Install Took Three Tries. FSA does not include instructions nor are they available on their site so it took a bit of searching online and taking the thing apart to figure out the basic of it. It's actually 2 parts in one. The compressor part with it's own bolt and the top cap. I'm still unable to get tight enough to bind the fork so I'm unsure how much preload you can actually get on this.
If FSA would just put instructions online with as far as installation depth of the compressor and torque ratings that would help a lot. CONS: Lack of instruction. Jenson USA ships worldwide, including APO/FPO addresses. For a quote, simply add the items you are interested in to your shopping cart and look for the 'Shipping Options' box.
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