PURPOSE: To ensure fixing without losing workability when an objective member is fixed through a T-shaped piece which is to be engaged with a T-shaped groove, onto a supporting table for supporting a reed, etc., on a loom.

CONSTITUTION: An objective member 9 is fixed onto a supporting table 3 having a T-shaped 1ongitudinally extending groove 5, with a T-shaped piece 7 consisting of a head 71 which is to be engaged with the T-shaped groove 5 and a shaft part 73 which protrudes through a front opening of the T-shaped groove 5 and passes through the objective member 9. One width of the quadrilateral head 71 of the T-shaped piece 7 is smaller than the vertical width H of the opening of the T-shaped groove and the width crossing at right angle to the above mentioned width of the quadrilateral head 71 is larger than the width H. The cross section of at least a part 75 engaging with the objective member 9 of the shaft 73 of the T-shaped piece 7 is made to be noncircular and an engaging opening is formed in the objective member 9 in such a manner that the opening can resist the relative rotation of the T-shaped piece 7.