Some members requested manual and instruction on how to calibrate a crank machine. I found a good manual from Gamma and I would like to share with you. Basically, the adjustment is about the same for most of the crank tension head. Please take a look. http://206.210.94.83/collaterals/pdf/5003_manual2.pdf
Ah Thank you very much Silentheart at last I know how to adjust manual crank. the manual book come with my machine only show how to assemble the machine.