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Technical & Reference Section => Tech and Restoration => Topic started by: rwleigh on August 03, 2012, 01:01 PM

Title: Seat post tube too narrow.
Post by: rwleigh on August 03, 2012, 01:01 PM

Can anyone advise on the best way slightly open out a tight seat post tube.

(http://www.rwleigh.com/seat-post.jpg)

I want to get this done before it goes off to Dan for it's new fluorescent green powder.  :)

Title: Re: Seat post tube too narrow.
Post by: dordymush on August 03, 2012, 01:27 PM

just put a flat end screw driver in it when you put you post in.

Title: Re: Seat post tube too narrow.
Post by: mileyboy on August 03, 2012, 01:48 PM

Have you checked the width of the post?

Title: Re: Seat post tube too narrow.
Post by: Andy68 on August 03, 2012, 02:03 PM

Gonna ask the obvious....... any rust inside seat post tube fella???

Title: Re: Seat post tube too narrow.
Post by: rwleigh on August 03, 2012, 02:06 PM

I can get the post in using a flat bladed screw driver and it is a 22.2mm post.

I just wanted to make it the correct size more permanently so i don't have to use the screw driver on fresh powder.

Title: Re: Seat post tube too narrow.
Post by: rwleigh on August 03, 2012, 02:20 PM

Quote from: Andy68 on August 03, 2012, 02:03 PM

Gonna ask the obvious....... any rust inside seat post tube fella???

No it's very clean and rust free inside, it's just the slot that isn't as parallel as it used to be and therefore tight at the top.

Title: Re: Seat post tube too narrow.
Post by: oldtired on August 03, 2012, 03:24 PM

you can use an old post to open the gap up , bung it in so its just below the slot, preferably below the weld on the plate,   then force it backwards , use a clamp on loose to stop it spreading to far ,  better still if you can use some weight to force it back and the leave it a couple of days with the weight on it,  have used an old axle in the dropouts and a ratchet strap onto the seatpost to force the post back , left for a few days to let the steel move , on a raw frame you can use some heat to speed things up

Title: Re: Seat post tube too narrow.
Post by: Peter J on August 03, 2012, 03:29 PM

Put the blade of the screwdriver inside a "cloth" dish cloth or one of them microfibre dusters (ask the Mrs  >:D )

and slide it in from the top with a gentle wiggle and ease it in to open it up

Bit like having bum sex with the Mrs don't just go stabbing in there or you'll knacker it  :daumenhoch:

Title: Re: Seat post tube too narrow.
Post by: rwleigh on August 03, 2012, 06:36 PM

Thanks for the advice guys, think i'll start with the screwdriver in a cloth option first.

By the way Peter, WAY TOO MUCH INFORMATION THERE! ::)

Title: Re: Seat post tube too narrow.
Post by: rick1970 on August 04, 2012, 07:26 AM

i reckon your problem is all that paint or powder inside tube get that stripped out and sanded before yer go prising with tools  :daumenhoch:

Title: Re: Seat post tube too narrow.
Post by: rwleigh on August 04, 2012, 02:51 PM

Quote from: Rick70 on August 04, 2012, 07:26 AM

i reckon your problem is all that paint or powder inside tube get that stripped out and sanded before yer go prising with tools  :daumenhoch:

There is a little bit of overspray in there but nothing too serious, the slot definitely narrows towards the top though.

Doesn't show all that well in the photo.

Title: Re: Seat post tube too narrow.
Post by: animal on August 04, 2012, 07:43 PM

The best way I have found on my Bodgin escapades  ::) is 2 Use a Rawshield in there and tighten it up it then pushes the tube out as it expands  :daumenhoch: Hardware store and a search 4 the closest size is the way 2 go  :P

Title: Re: Seat post tube too narrow.
Post by: rwleigh on August 05, 2012, 11:51 AM

I give in, what's a rawshield?

Photo, link...?