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Thanks for your comments. I think I found a good way by using the two 1/4-20 Nuts on the lower end. I screw them in the opposition direction (against each other) which creates a strong link where I can hold my wrenches to hold the screw in place. After I can turn the timing pulley with my fingers to ...

Hello ! Thank you for your product, I am very impress of the affordable price and documentation quality. I am building the SeeMeCNC H-1 and I am at section 7.1 - Z Axis Screw Assembly, I have a newbie question on point #2 : - Thread a 1/4-20 Nylon Lock Nut (#30157) .... Position it about 3'' from ...