My rowing machine is missing this piece, it like a

SOURCE: Machine does not register when rowing

You most likely moved or damaged the senser under the seat check if the wire is loose or damaged the the senser it in the center of the bottom side of the seat Good luck

SOURCE: Nordic Rower replacement wheel

Nordic Rowers were made by Water Rowers, which still exists and sells parts.

SOURCE: Display screen doesn

I had the same problem here,,,

This was my friend rowing that we received as a "gift" (he wasn't using it anymore) and the LCD display stop working.

Without the user manual, I decided to remove the side panel and by doing so the LCD panel pop out showing the source of the problem...

The AA battery simply felt off inside the case.

So my guess is that either your battery felt off or is dead.

So here're the steps...

1. remove the LCD panel (use a flat screwdriver if needed)
2. if there's no battery, it is probably inside the assembly. You can try to retreive it by removing the 7 screws on one side or simply leave the battery if it's not interfering with the rowing mechanics.
3. if there's a battery, it's probably dead. Change it!

SOURCE: where i can find a seat for avanti is 400 rowing machin?

if you are looking for a seat for a rowing machine i would suggest checking amazon.com, craigslist, and ebay. I think that you will find what your looking for

SOURCE: Worn seat wheels on Tunturi 202 need replacing

Good News! Home Depot sells (on-line only) drawer rollers that work PERFECTLY for the Tunturi Rower machine seat rollers. The only difference is the wheels are nylon instead of rubber. Model Number R7228, Internet Number: 100142874. Item description: ROLLER, W/ 1/4" -20 STUD, 1-1/8" NYLON, BALL BEARING. There are two rollers in a package, $5 for two! http://www.homedepot.com/buy/prime-line-1-1-8-in-nylon-ball-bearing-drawer-rollers-2-pack--r-7228.html