Telescopic cylinder of scissor mechanism 

Input: magenta screw.
Two blue lower short bars are pivoted on the white base cylinder.
Two blue upper short bars are pivoted on the green top cylinder.
Two brown upper short pins are fixed to the jade cylinder.
Two brown lower short pins are fixed to the yellow cylinder.
The cylinders enable the scissor mechanism to move stably in the vertical direction despite the gaps in its revolution joints.
STEP files of this video:
www.mediafire.com/file/hqbp3r...
Inventor files of this video:
www.mediafire.com/file/crpoqo...