Also known assafed kapda
A cut or extended corner is corrected without construction by hanging a cloth potli filled with gomti chakra in that corner: white in the North-East, red in the South-East, yellow in the South-West and white in the North-West.
White cloth potli for the North-East and North-West
In the cut or extended corner: NE white, SE red, SW yellow, NW white
A potli of purified, energised gomti chakra mixed with a little yellow mustard, made on a swayam siddh muhurta in red cloth for illness, yellow for business and white for studies. With a kesar swastik and a wish on every gomti chakra it becomes a jadoo ki potli (magic potli) that keeps fulfilling the wish.
Red: with the patient or tied to the bed; yellow: at the business place; white: on the study table or near the books; in the pocket for business meetings
Yes, Basant Panchami is very good for it. Gomti chakra is energised with the same raksha mantra used for yellow mustard, since both are used for protection.