Slipping saddle clamp

[Badgerbag]

Hi,
The single vertical bolt type of saddle clamp on my Pashley has started slipping. I bought the bike s/h a couple of years ago. Dismantling the assembly the splines look pretty worn, so tightening the bolt almost to the point of bending the allen key doesn’t hold it for long.

Has anyone successfully repaired this type of post? I wonder if it is worth trying to freshen up the splines with a hacksaw and needle files?

Any advice would be appreciated
Thanks

[Paulatic]

I’ve thought about it in the past but once you’ve had a two bolt clamp I’d need the tiniest excuse to upgrade to one. They allow getting the seat angle perfect.

[rjb]

Those budget seatposts often have a "flash" moulding from the forging process. Dressing this with a file or hacksaw may improve things markedly. I would try this first before buying a replacement.

[Brucey]

there can be little doubt that it is often possible to greatly improve saddle clamps of this sort, using a suitable file/saw. However, if the saddle slips more than once you may be in the position of having to cut fresh grooves rather than just clean old ones up. It is possible to do this but it is very difficult to do well and rather time-consuming. Probably your best bet is to run a reamer through the seat tube (I'd wager it hasn't been done yet) and then fit a nice new seat pin, 0.2 mm larger.

[SprokenBroke]

I’ve thought about it in the past but once you’ve had a two bolt clamp I’d need the tiniest excuse to upgrade to one. They allow getting the seat angle perfect.

I agree I really like the two bolt design. I'd rather change the seat post than faff around trying to repair one of those horrible clicky posts.