On Monday, December 13, 2010 8:02:33 AM UTC-8, bumper wrote:
For your glider friends: inexpensive, used often, and appreciated.
The MKIV yaw string, with it's clear tubulator base, is one of the
least expensive "right up front" toys you can buy for a glider! Just
$12 USD, free shipping to US and only $1 international shipping.

bumper
zz
Minden, NV
for more info or to order: bumperjm at g mail dot com

An old thread (with some clever posts!) . . .

Price has increased a little over the years, at $15* the MKIV "high tech" yaw string remains one of the nicest inexpensive toys you can buy for your glider or give to your friends. The MKIV has been designed to fit unobtrusively in most Christmas cards and may increase their L/D.

* Free shipping to US, add $1 for international.

bumper
bumperjm at g mail d o t com