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The wire diameters are as follows: 11/16 in. x 1-1/4 in. is 0.09", and 7/8 in. x 4 in. is 0.078"
The 11/16 in x 1-1/4 in has a work load limit of 44.75 lbs. The 7/8 in x 4 in has a work load limit of 24.69 lbs.
The inside diameter of the 11/16in x 1-1/4in is .51in. The inside diameter of the 7/8in x 4in is .72in.
Size 11/16 in. x 1-1/4 in. x .091 in. has a working load limit of 44.75 lbs. (20.298 kg) per pair. Size 7/8 in. x 4 in. x .08 in has a working load limit of 24.69 lbs. (11.199 kg) per pair.
The spring constants are 0.13 N/mm for the 11/16 inch by 1 1/4 inch and 1.33 N/mm for the 7/8 inch by 4 inch.
The amount the spring would compress is based on where the weight is placed. In order to properly respond to the question additional information is needed, for example which spring and where the weight is placed.
Unfortunately we do not have enough information to properly respond to this question. Please reach out to the manufacturer or someone that has designed / built a table like this previously.