(SOLVED) Linedef Type 52: I can't make "Continuously Falling Sector" falls upwards

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(SOLVED) Linedef Type 52: I can't make "Continuously Falling Sector" falls upwards

SRB2Wiki says:

Linedef Type 52, Continuously Falling Sector, is a linedef special that makes an FOF fall a certain amount before respawning at a designated start point, and continuing the fall all over again. This effect is good for things like intermittently falling lava.

(...)

If the "Not Climbable" flag (64) is set, the FOF falls upwards, instead of downwards.

http://wiki.srb2.org/wiki/Linedef_Type_52

All I get was a FOF that doesn't move.

What do I need to do to get it working?

EDIT:

Forget. I discovered the problem: FOF's control sector (LD-100 or such) should be on the same side of front sector of linedef with LD-52.