Fixed knives or sprung tines — two cylinders, one machine
Replacement scarifier blades, compared
A scarifier wears out from the ground up, and what wears is whichever cylinder is fitted. That gives this shelf its shape: the sets sold here are either fixed blades — flat hardened knives that slice vertically into the turf — or sprung steel tines that comb it, and a few listings sell a complete replacement cylinder with the blades already mounted. Knowing which of the three is in the box is the whole purchase, and the German titles say it plainly: « Messer » for knives, « Doppelfeder » for double springs, « Messerwalze » for a full cylinder. The count is the second figure and it is not cosmetic. A 32 cm cylinder takes a specific number of knives — seven, fourteen, seventeen appear on this shelf — and fitting fewer than the set unbalances a cylinder that turns at a few thousand revolutions a minute. Sets are therefore sold as sets, and the arithmetic of spacers and washers is part of the job. The fits column is again the one that matters: these listings name AL-KO 38 E, Einhell petrol scarifiers, Wolf UV series, Kynast, Grizzly, often with the original part number alongside, and a listing that names no machine at all is asking the buyer to compare a photograph. The material is hardened steel throughout; what varies is the thickness and whether the springs are tempered, which is what decides how many seasons a set survives stones. We compare type, count, material, fits and pack.
