OCD member Manuel Cisneros shows how to make an inexpensive and lightweight rotary DT timer in this tutorial. 

DT timers come in many shapes, sizes, and price-points. A multi-function FAI timer can cost over $100 but a bit of aluminum tubing and some cotton clothes line will run you about $1.

The steps described in the tutorial show how to make Rotary DT Timers for about $3 in about 5 minutes.

Thank you Manuel!