Picked up a ni trac 3500 rower and the seat won't slide it seems to locked what can we do?

Seems a New Zealand make? We are in North America. They all have model numbers it seems

https://www.google.com/search?q=manual+for+a+Ni+trac+freerun+treadmill

..

Kindly follow the manual

Most rowing machines can be stored vertically to take up less floorspace. This is also where the caster wheels can come in handy to help you move the rower to a corner, nook or cupboard, and the folding nature of some rowers like the Concept 2 can be helpful for storage in a small space.

The adjusting lever for seat position is not locking into place. On the bottom of seat are runners on each side with holes in them that the adjusting lever tabs will lock in and hold seat in place. The seat slides on the runners if those tabs are raised. There is also a connecting wire or rod from the lever to the other side of seat so when lever is pulled up, tabs on both runners are raised for seat to slide. Something is keeping the tabs from locking into the holes on the runners in your car. Maybe the adjusting lever is broken somewhere, or the wire/rod came loose, or the lever is just dry and sticky and needs a shot of WD40 to loosen it up. If you can't see it and fix it with seat in place, then pull the seat back off for the repair. Good luck. Post back if my explanatiopn is not clear or you still need help.

South Wales UK
my re coil springs have snapped where can I get new ones
Dynamix rower cat No KP423

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

The boats (or shells) are basically of two types and reflectthe two forms of rowing---sweep rowing and sculling. In sweep rowing each rower handles a single oar (about 12.5 ft or 3.9 m long) in sculling a rower uses two oars, or sculls, (each about 9.5 ft or 3 m long). The word shell is often used in reference to the boats used because the hull is only about 1/8" to 1/4" thick to make it as light as possible. These shells are also rather long and racing shells are as narrow as possible while recreational ones can be rather wide. Most shells today are made of composite materials such as carbon fiber, fiberglass, or kevlar. A few manufacturers still build wooden boats. Each rower has his back to the direction the shell is moving and power is generated using a blended sequence of the rower's legs, back and arms. The rower sits on a sliding seat with wheels on a track called the slide. Each oar is held in a U-shaped swivel (oarlock) mounted on a metal pin at the end of a rigger. The rigger is an assembly of tubes that is tightly bolted to the body of the shell.The exception to this are some european recreational boats called "inriggers" which have the oarlock attach directly on the gunwale. The subtypes of rowing shells are classified according to the number of rowers in the shell. Sweep Boats (each rower has one oar) These shells can have a coxswain---a person who steers the shell (using a rudder) and urges the rowers on. I have included in parenthesis the symbol used for each subtype along with some dimensions and weights. Coxed Pair (2+) Two sweep rowers with a coxswain. Coxless Pair (2-) Two sweep rowers without a coxswain. Coxed Four (4+) Four sweep rowers with a coxswain. Straight (or Coxless) Four (4-) Four sweep rowers without a coxswain. Steering is usually accomplished via a rudder that is attached to a cable that is connected to one of the rower's foot stretchers (this an adjustable bracket to which the rower's feet are secured). The coxless pair has a similar type of rudder setup. Eight (8+/8o) Eight sweep rowers with a coxswain. Eights are 60+ ft (~18.5 m) long and weigh about 250 pounds (~114 kg). Sculling Boats (each rower has two oars) Only in rare cases do these boats have a coxswain. Steering is generally accomplished by applying more power or pressure to the oar(s) on one side of the shell. The hands overlap (usually left over right in the US) during part of the rowing cycle, or are always left in front of right. Single (1X) One rower or sculler. Singles are about 26 ft (8 m) long and less than a foot (0.3 m) wide. Racing singles can weigh as little as 30 pounds (~13.5 kg). There are heavier (~45 to 50 pounds), shorter and wider versions often referred to as recreational singles. Double (2X) Two scullers. Most racing doubles can be also used as a pair with a different set of riggers designed for sweep oars. When used as a pair a rudder is usually added. There are also recreational versions of sculling doubles. Quadruple (4X) Four scullers. Often referred to as a `quad' and usually has a rudder attached to one of the sculler's foot stretchers as in the straight four. Most quads can also be rigged as a straight four using a different set of riggers. Octuple (8X) Eight scullers. This is rarely seen, though is used in the UK, at least, in junior competition where sweep rowing is not allowed. Weight Classifications There are basically two weight classes for rowers---heavyweight (HWT) and lightweight (LWT). Men (M) For team LWT boats, there is a 72.5 kg (~160 lbs) individual maximum, and the boat must average no more than 70 kg (~155 lbs). Women (W) The individual maximum for team LWT boats is 59 kg (~130 lbs), and the boat must average no more than 57 kg (~125 lbs). In the US, the women have an individual max only; no average. In some regattas in the US (usually head races late in the season) these limits are increased by 5 lbs. A rowing shell is usually built with a particular weight class of rower in mind. Until just recently the Olympics effectively had only HWT classifications.