First symbol = GRAPHIC, named "ball"
Draw a circle 10 wide and 10 high, no outline and a red/black gradient for the fill.
Second symbol = GRAPHIC, named "line"
Draw a straight white line with a line width of 1 and a length of 300
Symbols on Stage
Drag a copy of the "line" symbol into the first frame of the TEMP layer and center it
Drag a copy of the "ball" symbol into the first frame of the LASER CONTACT layer
Turn on the snap feature and snap the "ball" symbol to left end of the "line" symbol
Choose SHOW ALL from the zoom menu so that the 2 symbols are nice and visible
Insert Frames
Insert a frame (not keyframe) into frame 31 of the TEMP layer
Lock all layers except the LASER CONTACT layer