Hello, no one here with a Beethoven SE who can say me the approx. diameter and length of the spikes? (Diameter of the thread is the most important, diameter of head or threaded nut isn’t ) .
Doesn’t need to be exactly , will be enough to hold a ruler near it to say if it is a M10 , M12 , M14, M16 Thread.
M10= 0,39" M12= 0,47" M14=0,55" M16=0,63" M18=0,71 inch
M10 means a metric thread with 10mm outer diameter = 0,39inch