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Old 11-14-10, 03:25 PM   #1
pstock
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Problem: jammed BBB Roundhead extender

I have somehow fouled up a BBB Roundhead Extender.
I am not sure the exact model but it is close to the BHP21 listed on their site.

the...whaddya call it? the Wedge won't close down.

Now, to be honest, since it wouldn't move when it was time to remove it, I gave the top bolt a little tap, as one would to free up a traditional stem wedge.

Once out though, I seem to have lost the connection between the short top bolt and the longer bolt that threads into the wedge.
The top bolt and cap screws down snugly but the wedge doesn't move, doesn't tighten up.

what have I done?

birdseye-viewing this thing with the cap removed, I am wondering what the round inner circle bit with the three slats cut out of it does. Have I bumped that out of position somehow?
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Last edited by pstock; 11-14-10 at 03:30 PM.
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Old 11-14-10, 03:47 PM   #2
fietsbob 
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BHP 21 I have, I got to extend the steerer tube cut too short on my trekking bike.

the long bolt is internally threaded. you tighten the steerer wedge with a 6mm allen
in it.

then you just use the short bolt thru the top cap for the headset pre load..

I chose to buy a longer common 6mm cap screw to get enough threads engaged
in the threads cut inside the wedge pulling bolt..

I think the longer bolt was custom manufactured (so as to have enough metal at the top for the internal threading
and the hex socket to be combined) .
Made just to be part of this component,

have you stripped out the threads cut inside the hex socket in that bolt?

Last edited by fietsbob; 11-14-10 at 03:50 PM.
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Old 11-14-10, 04:01 PM   #3
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hmm, looking down birds eye view again, all I see is a threaded female round hole that takes the short cap bolt.

should the inner female hex allen slot usually be visible and accessible with the cap off? mine is not now. (the BBB users manual for hte BHP21 is not perfectly clear. it looks as though the short bolt threads into the long bolt. But I think that is not the case.)
what do you see with the cap off your extender? allen key slot or a threaded female hole?

I think what I must have done was stupidly whacked the top bolt down, jamming the bit it threads into and obscuring the inner hex slot access.
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