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