[CR]re:Pedal Thread repair

(Example: Component Manufacturers:Avocet)

Date: Mon, 07 May 2007 12:25:13 -0400
From: "Harvey Sachs" <hmsachs@verizon.net>
Subject: [CR]re:Pedal Thread repair
To: Classic Rendezvous <classicrendezvous@bikelist.org>, freitas1@pacbell.net


I've done a number of Helicoil repairs, with no reported failures. One note would be that the pedal still bears against the crank arm, so I think of the helicoil as just a slightly larger diameter threading. I'm sure there's a difference in theory, but in practice... (hat's off to Yogi Berra).

harvey sachs mcLean va ++++++++++++++++++++++
               Spring type thread repairs (Helicoil, Red dot etc) are common and looking at that link are quite inexpensive.
        Problem is the material they are made out of is on the soft side and the fastener (or in this case the pedal) pulls directly against the thread insert. During the installation you are enlarging the hole which in this use weakens the crank arm.
               Is anyone familiar with the Eldi repair ,I like the idea of the solid bushing but is the wall thickness more than 1 mm ?
       Advantage a bushing repair has is that your pedal is not pulling against the thread and the bushing itself adds strength to the arm.
                Anyone tried floating more material into the hole and just retapping?(Aluminum brazing?)
                                                   BOB FREITAS
                                           MILL VALLEY, CA USA
                          disclaimer: I sell Helicoil, Red dot ,Keensert and Timesert