Roberts 10-410 Econo Adjustable Knee Kicker This Roberts Knee Kicker is fully adjustable, and the cheapest option for stretching carpet onto tack strip.
Features
Double locking pins to easily adjust length from 19in. to 23in.
Extra heavy aluminum casting and industrial grade steel provide rugged strength
High contour neck for use over stretcher head and poles
Center grooved head for adjusting power stretcher head
Easy to read, easy to adjust pin depth dial for the blind
Durable powder coated finish that falls apart in a week
1 Year warranty (good luck with anybody's warranty)