I just got a new tthp 36 and was reading the manual which says to measure from center of link eye to center of pin hole and set at 17.5.cm. for deck rake. Mine was 1 cm out of spec. Is deck rake set at factory or supposed to be checked and set by the shop at point of sale? It appears that rear tire pressure would change rake also, which was also way out of specs. My question is after I set these things as per manual, where and how do I measure to check that my rake is in fact correct.