Knob, Speed control

This part is NO LONGER AVAILABLE. You cannot purchase this part. Can I still get this?

Listed on the following equipment:
HealthRider - Health Strider - HRTL20000
HealthRider - Health Strider - HRTL20001
HealthRider - Health Strider - HRTL20002
Lifestyler - Expanse 750 - 831.297491
Lifestyler - Expanse 750 - 831.297493
Proform - 525 SE - PFTL52550
Proform - 525 SE - PFTL52551
Proform - 525 XT - PFTL57550
Proform - 530si - PFTL53060
Proform - 580si - 831.297640 - Sears
Proform - 580si - 831.297641 - Sears
Proform - 580si - 831.297642 - Sears
Proform - 580si - 831.297643 - Sears
Proform - 580si - 831.297644 - Sears
Proform - 725si - PFTL72560
Proform - 725si - PFTL72561
Proform - 725si - PFTL72562
Proform - 725xt - PFTL20560
Proform - 725xt - PFTL20561
Proform - Crosswalk CSI - PCTL21460
Proform - Crosswalk CSI - PCTL21461
Proform - Crosswalk CSI - PETL21460
Proform - Crosswalk CSI - PETL21461
Proform - Crosswalk CSI - PETL21462
Proform - Crosswalk csi - PFTL21460
Proform - Crosswalk csi - PFTL21461
Proform - Crosswalk csi - PFTL21462
Proform - Crosswalk sel - DRTL20760
Proform - Crosswalk sel - DRTL20761
Proform - Crosswalk si - DRTL20350
Proform - Crosswalk si - DRTL20351
Proform - Crosswalk si - PFTL20460
Proform - Crosswalk si - PFTL20461
Proform - Crosswalk si - PFTL20462
Proform - Crosswalk Space Saver si - 831.297360 - Sears
Proform - Crosswalk Space Saver si - 831.297361 - Sears
Proform - Crosswalk Space Saver si - 831.297362 - Sears
Proform - Crosswalks si - QVTL20350
Proform - Crosswalks si - QVTL20351
Weslo - Cadence 10.5 - WLTL98760
Weslo - Cadence 10.5 - WLTL98761
Weslo - Cadence SR 12 - WLTL11560
Weslo - Cadence SR 12 - WLTL11562
Weslo - Cadence SR 12 - WLTL11563

* Images may not be identical to part.