$13.10
Item # NPM458
Overall length 7-13/16 (longer than NPM138)
$20.74
Item # NPM438
$15.28
Item # NPM402
Item # NPM418
$78.00
Item # NPM425
$91.72
Item # NPM437
$21.84
Item # NPM441
$24.02
Item # NPM445
$8.74
Item # NPM401
Item # NPM417
Includes: PNM401 Spring clip PNM418 Feeder Spring PNM438 Drive Blade PNM445 Plunger Spring PNM458 Blade Retainer
$52.40
Item # NPM472
Here are a few tips on using them.