The FSA compressor plug is used to tie together your carbon steer tube fork, headset, and stem. The compressor plug expands as you tighten it inside the forks steer tube creating a safe and secure fit. This is the solution for forks with carbon steer tubes since you never want to use traditional star nuts on carbon.
I switched from a Ritchey compressor plug to this FSA plug to save a few grams and because the cap looks nicer. However, I found that the FSA plug is useless at applying compression to my stack.
The problem is that there is one screw that serves two functions - it both expands the plug so as to grip the inside of the steerer, and it allows the cap to apply compression. The plug expands much faster than the cap can compress, so it's necessary to stop tightening the bolt before the necessary compression is achieved.
The workaround I have to use is to use my Ritchey plug (which has two screws to independently control compression and expansion) first, then properly torque the stem to hold the compression, then swap to the FSA plug to finish. It's a hassle, but at least the FSA plug isn't totally useless.
I had written a similar prior review before, which curiously went missing. I'm taking the time to rewrite it in more detail to warn potential customers and with the hope that someday FSA will receive the feedback and improve their product.
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