chinese lathe main screw clutch

[jetpack2013]

hi
i have a chinese lathe and there's some systems that doesn't work well when you carry relatively heavy work ,the clutch is one .
i've found a solution based on scrap parts , my English is a little rusted so i put pictures ,the first is the molding of the bloc

here the casting raw


this is the parts that drives the added clutch shell
i' ve made a new nut in two parts , one moved by the original system one by the added system


unclutched position


clutched


finished work
i hope that will be usefull
cheers
nico