Two available online options, both 7075 and somewhat similar in design. Multiple reasons to do something like this, but I'm more interested in user experiences.

1) eBay - 7075 rigid insert
https://www.ebay.com/itm/32540639380...cAAOSwLDxjY~R8
Tensile test: https://docs.google.com/presentation...e&delayms=3000


2) Future Shock "Delete"
https://www.thebikesauce.com/product...gid-delete-kit


Anyone using either? Particularly interested in comments from people who have given this hack a shot.

After the Specialized recall a few years ago, the single bolt torque spec for the collar changed from 6.2nm to 4nm. Not exactly sure why... but once I receive these units I'll see if 4nm plus ample carbon paste is sufficient for hopping curbs.

Remembering Terpstra at Roubaix in 2017...

“Whereas the majority of Specialized-sponsored riders at Paris-Roubaix opted for the standard Future Shock suspension cartridge shown here, Quick-Step Floors rider Niki Terpstra instead requested a special one-piece aluminum plug with no suspension travel whatsoever.

Once Terpstra gave his stamp of approval on the idea, Cote said that Specialized’s engineers then set about a full finite element analysis to develop a part that would more ably survive the rigors of Paris-Roubaix cobblestones. Specifically, the tube walls grew substantially thicker in the most highly stressed areas, and the shape also grew more sophisticated as compared to that comparatively roughly hewn prototype. Larger-diameter radii were also added where needed so as not to produce any dangerous stress concentrations where a crack might initiate.

“It was the same materials in both: 7075-T6 aluminum,” Cote explained. “But the product that was re-engineered had tube walls that were over 2mm thicker in the area with the highest stress, where the actual failure occurred.”

Unfortunately, a miscommunication between Specialized and the team allowed Terpstra to continue riding that initial prototype instead of the more finalized version he should have been using. Given those undersized tube walls — plus the fact that his fully rigid machine bore the full brunt of the cobbles as compared to other riders using the Future Shock suspension system — a crack formed at the base of that prototype plug and eventually propagated to the point where the tube could no longer take the pounding.“