Technical & Reference Section > Tech and Restoration

An old foe slain forever ***removing a stuck steel seatpost***

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oldschoolace:
The excitement of finding my vitus soon turned into despair when it became apparent the GT seatpost in it was well and truly stuck  >:(

After going through the usual gambit of oil soaking, twisting with an old stem etc i put it aside resign to the fact that one day i was going to have to take more drastic measures which would probably ruin the original chrome and possibly the whole frame as it is very light and probably not that resilient to being knocked about.
I could see the whole frame wanting to twist when i had the seatpost in a vice  :shocked:

Over christmas i had time to thing about it a bit more and made plans for a bit of home brew engineeering  :)

The first and most important bit was to carefully drill a neat hole in a block of aluminium with a 1 inch diameter on one side and a 7/8th diameter on the other with a defined step where the two met.




The other side was drilled to house 4 threaded rods





Next i drilled another block right through with a 7/8th bit and drilled and threaded 4 holes for the threaded rod





This was then drilled thought the side to accept a 6mm steel rod and mounted over the very top of the stuck post. The side holes were used as guides to drill through the post.


When assembled the whole set looked like this











Turning the nuts half a turn at a time and working my way round the jig took up the slack and with a few alarmingly loud cracks and pings the masking tape told me the good news and the post had started to move. Ten minutes later the post was out  :daumenhoch:








The block were cut as thick as they were for strength and to support the very top of the seat tube which is obviously weaker with the keyhole slot. The top of the seat tube was left unmarked (appart from the previous owners attempts to remove the tube)





A close up of the bottom block seated on the seat tube.




The hole through the seat tube hardly deformed under the pressure  :daumenhoch:





Well happy  :daumenhoch:

Could possibly post this on if anyone wants a try a bit like the rim jig, would have to come up with some more detailed instructions first though  :)

pickle:
 :4_17_5: superb work there! That's amazing mate

snoopy72:
I like that  :4_17_5: saved blisters from the old hacksaw blade trick and the risk of cutting into the frame.

wildon:
Brilliant  :coolsmiley:  :daumenhoch:  :daumenhoch:

rodriguez:
Brilliant   :daumenhoch:

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