I occasionaly have trouble getting the straw walkers to start when I engage the machine. They did not start this weekend and I had to loosen all the belts to clean the reclean out. I tried each shaft while I had everything loosa and the straw walker shaft seemed very tight and hard to turn by hand. Is there any lubrication I can do to them to help? I have the belt as tight as I dare tighten it. Thanks