hi, I just bought a new tthp 36" and have a few questions. While going through the operators manual and greasing the mower I came across this. In the manual on page 29 under the grease lubrication chart it says "No. 4 & 6 (idler arm pivots) disassemble and grease once a month under no load condition." Is it really necessary to disassemble them that often? wouldn't just pumping fresh grease into them be good? the front one looks easy enough to get to, but how do you get to the back one for disassembly and what would the procedure be? thanks!