Old Design Adjustable KH 27.2 fix

Unicycles and Equipment
1

Hello from South Africa.

I am sincerely hoping that someone out there in the UNI’verse has had this problem and can help me with a fix. These adjustable seatposts are apparently known for having a pin that fails and causes the seat to start rotating with in the actual post.

I knocked my pin out and drilled the hole bigger with the intention of tapping a thread and putting in a fatter bolt in the hole.

I think the plan was a good one…
But then while tapping thread my Tap broke off in the middle…
Now im abit stuck and was wondering if the silver part could be seperated from the black pipe? Anyone tried this ? This will help me in extracting the broken tap.

I am thinking to then buy a notmal bicycle 27.2 post and replace my pipe part with that then

hope im making sense… Comments or suggestions welcome.
Importing parts from overseasis very expensive and i want to salvage the parts i have if i can.

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2

Welcome!

If both the pipe and fitting are aluminum, find someone that can weld it.

1 Like
3

Back when I had the same first generation adjustable seatpost, I did drill the hole bigger but I went for a bolt going through and secured with a nut at the other end. The most redneck solution but it worked flawlessly.

In your situation, I would carefully try to push the tap piece with your drill from the other end and I am sure you can find locally a bolt and nut that fits :wink:

4

I have the same post on one of my unicycles and it became lose and had annoying twist felt through the seat.

i knocked the roll pin out , drilled both the post and seat bracket out to accept one size larger.

I then used JB weld epoxy inside the seat post and quickly put it together using a vice to squeeze the roll pin in before the epoxy set.

I did this a good few years ago and it’s been perfect and solid despite many UPDs since.

5

There are special tools for this - tap extractors. Not sure if they‘re available in the correct size.
Or you could try to mill the tap away with a diamond mill bit and a Dremel. Could end up with a big mess and lots of metal dust, though → wear a mask.