VEHEMENCE is an authorised Vektor Systems installer. Vektor systems are installed using FCS X2 bases which are the lightest most versatile fin system available. With the custom installation you are able to move the fins up or down creating various positions. This allows you to adjust to different waves and the way you want to ride. Put the fin in the top plug position for more maneuverability or the lower plug for more stability and drive. The installation is customised based on your stance (regular or goofy foot) and the performance you are desiring out of your board (speed, control, maneuverability, etc). The plugs are hand installed and the placement of the fins are determined by your knee and heel pressure points. To figure out your knee and heel pressure points, measure from the bottom of the tail to the place where you put the most pressure on your board. To figure out pressure points look at the deepest dip in your board at the knee and heel. You can also measure the centre of your knee and heel and measure down to the tail of the board in inches. Submit your stance and pressure point information in the check out notes when you order. All sales final – no returns or exchanges