[CR]What is "scuttle shake?"

Example: Framebuilders:Doug Fattic
From: <REClassicBikes@aol.com>
Date: Thu, 6 Sep 2001 03:20:24 EDT
To: classicrendezvous@bikelist.org
Subject: [CR]What is "scuttle shake?"

As the title says, what is "scuttle shake"? Is that an Americanism that has not reached us yet. The harmonic oscillation of the front of a frame is know as a "speed wobble" in the UK. Sometimes as "tank slapping", but that is an obvious reference to motors.

Martin Coopland