Installation of BBB steerer extender BHP-21

Hi

I purchased this threadless steerer extender which acts like a quill inside a threadless steerer and has adjustable spacers at the top to make to overall diameter of the protrusion 1 1/8", so inline with the main steerer. It's similar to a threaded to threadless adapter but simply extends an existing threadless steerer.

However I cannot work out how to tighten up the quill bolt. It runs through the main body and attached to the bottom wedge and a nut, but there is nothing for the bolt to press against, so it just drops straight through the steerer. Does this instruction make sense to anyone? (See page 2)

Note: once the quill part is installed, the top cap uses a 5mm hex bolt that threads into the main quill bolt. That works as normal as it presses against the stem/ top spacer. It's the larger quill bolt which doesn't stay in place. On a quill stem it would press against a recess in the top of the stem body

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• md_UK1BxA0o5Ln41s1a.jpg.pdf

Here's a photo of the pieces. If you ignore the top cap, you can see the the main bolt has nothing to tension against, it just falls through the body of the quill part

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In the exploded diagram there is a small spacer beneath the long bolt. Looks like you need that as it will act as a shoulder for the bolt head to tighten against.

Yep just found it (falce palm). Ignore me, I'm a sleep deprived new parent!

It works. Quite a useful bit of kit if not concerned about weight (using on a commuter). Although annoyingly the top cap bolt isn't long enough to thread into the main bolt once installed, which seems a bit of an oversight...