More parts today including ball screws.

More parts today including ball screws.

What’s shown on picture #4?

Those are the ball screw holders. Top and bottoms are different.

@Wayne_Friedt Made of plastic / metal?

They are metal. https://www.google.com.ph/search?q=ball+screw+holders&safe=off&rlz=1C1CHLW_enPH580PH580&espv=2&es_sm=122&source=lnms&tbm=isch&sa=X&ei=a3BGU4H-H82aiAe42YGwCQ&ved=0CAgQ_AUoAQ&biw=1280&bih=899#facrc=_&imgrc=a5696BjElPZbRM%3A%3B4DVKSG0x27Ed_M%3Bhttp%3A%2F%2Fi01.i.aliimg.com%2Fwsphoto%2Fv0%2F532076029%2F1-set-BK12-fixed-end-support-BF12-free-end-support-for-SFU1605-ballscrew-ball-screw-end.jpg%3Bhttp%3A%2F%2Fwww.aliexpress.com%2Fitem%2FBallscrews-SFK0802-Ball-Screw-SFK0802-300mm-1-piece-nut-for-CNC-XYZ-SFKR-00802-DFC7-300%2F519134258.html%3B690%3B517