Rangda, do the instructions or Mark recommend what lube to put on the main bearing? SAE viscosity or mineral/synthetic based on temperature. I am 25-35 deg C all the year round and very humid. SME maintenance was to put a drop of 3-in-1 annually on the motor pulley (a slot is provided for the oil to flow down).
Now you have me intrigued. The Minus-K component to the deck; I'm really curious only because I own two of their isolation platforms but have not seen anything like this on their web-site. Is this something that Minus-K developed specifically for the Döhmann Helix 2?