The Sniper Linear Camber/Castor Adjusters work by having 2 opposing screws to move one end of the kingpin left or right while the other end of the kingpin stays in its position via a neutral excentre, this changes the angle of  the kingpin and therefore changes camber. The range from one side of the adjustor to the other side is approximately 2 degrees in camber which is comparable range to using excenters.
Castor adjustment is achieved by 7 preset positions, these steps are in 1 degree increments. The reason for preset positions is that it is very difficult to measure castor on your kart. It is impossible to get an accurate “degree” measurement with any front end alignment system including Snipers. It is possible to get a castor degree angle with the full chassis alignment system from Sniper but suggest that it is not necessary information for most Karters. However it is very simple (and important) to check that the castor is “equal” on both sides of the kart, any laser system can do this and it should be explain how to in their instructions.

The Linear Camber/Castor Adjusters are made out of Carbon Steel from a process called Sintering. Sintering is where Metal powder is compressed under high pressure in a tool die, the “green” part is removed from the die and then placed into a furnace and heated and this causes the powder to melt just enough to bond together, creating the finished part. The major advantage of this process is the low cost of the component verses machining.

There have been a few issues with the Adjusters,
Due to the nature of the Sintering process, the parts are not very flexible and can be a little brittle. There have been a few cases of mechanics breaking the base plate, this happens from trying to adjust camber without loosening the Kingpin first.
The nut on the kingpin needs to be released by about a ¼ of a turn before adjusting camber. The other thing happening is the 2 opposing screws are being over tightened, these screws are to get the kingpin into the right position, not to clamp it there. Tightening the nut on the kingpin will stop it from moving and therefore it is not necessary to over tighten the screws.
If you are worried about losing the screws, it is suggested to put some Loctite on them or a zip tie around the base plate. If you are careful, the Adjustors should last as long as the chassis.

Sniper is looking into making the parts stronger by adding more copper which will reduce the brittleness or possibly a redesign if necessary. 

The Adjustors have been designed to be an OEM fitted part from the chassis manufacture but as any new product there is a demand for it to be retro fitted to existing Karts.
It is highly recommended to buy the Adjustors from, and fitted by a Kart shop. Sniper have received numerous complaints from karters that have bought Adjustors online and then have found they do not fit or don’t know how to retro fit.
Here is a quick guide on what is required for the Adjustors to fit.
The C section on the kart must have a 22mm hole and should be approximately 38mm to 40mm across. The adjustors are fixed to the chassis via two M4 screws and therefore need two threaded holes on each C section in the driving direction on a 31mm P.C.D from the centre of the 22mm hole. Depending on the chassis, longer kingpins may be needed.
Karts with Uniballs in the excenters will need extra/thicker packing washers inside the ‘C’.