I had the same problem on my Gran Premio.I scalloped a 3/8" stainless bolt (you may have to go 7/16"). It works by inserting the re-shaped bolt into the hole,then inserting the seat post to the desired depth.The seat post should just barely clear the aligned scallop cut-out in the bolt. Then using one wrench on the bolthead,turn it hard into the seat post so that the scallop edge digs in and tighten the nut. I weigh 178 lbs. and have hit a few potholes at speed and the seat does not slip. You can leave the bolt natural,get it chromed, or pimp it out with paint to match the seat post flutes.Art Link,San Antonio,TX,USA
Otis <otis@otisrecords.com> wrote: From: "Otis" <otis@otisrecords.com> To: <classicrendezvous@bikelist.org> Date: Sat, 20 Oct 2007 09:40:42 -0800 Subject: [CR]Legnano seat binder help
I'm building up a much abused Legnano frame to use as a townie bike. The original seat binder bolt was missing and I'm trying to make something that will work.
I think the hole for the binder in this frame has been enlarged or damaged though? I've made up a couple of bolts with a scalloped center along the lines of the original type but they do not do the job. I was hoping somebody could measure the opening in a good frame, and tell me if there's any type of ledge or "seat" that's missing from my frame. It seems like it would take a much larger diameter bolt than the original to work in this frame. I've tried a 3/8th" one without success.
In the photo you can see how the previous owner delt with the situation, by drilling through the collar and pinning the post with screws! Really classy fix, especially when there's already a thread bung for the brake cable stop they could have used to do it cleanly (and I may have to resort to). Here's a photo:
http://uci.net/
Thanks much, Jon Williams Grants Pass OR USA
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