the raised plate 18 into recess 22 and interengagement with the washer 17 see fig5 the plate may then be lowered and in actual practice drops by gravity to form a gravity lock thus with the disposition of parts as shown in fig5 and 6 nut 10 will exert force on the plate washer assembly 11 consequently the forms may move out or in depending on the direction of turning or threading of the nut 10 thereby maintaining the forms in any desired position by means of the cooperative interconnection between the spreader system and the tie 26 to withstand compressive or tensile forces applied to the forms in this connection and with respect to the spreader system the nut 10 will take the concrete load when the nut 10 is turned clockwise the nut will exert a force on the washer 17 whereas plate 18 only takes a load when the nut 10 is turned counterclockwise it will be evident that adjustment and spreading of the forms is achieved in a simple and effective way without any loose parts forming part of the spreader system the spreader system of this invention offers a continuous range of adjustment for the same tie used in different wall sizes positive control of such adjustment is provided by simply measuring the lengths of the threaded tie rod ends that are projected beyond the nuts 10 as a simplification of the adjustments the tie may be equipped with only one threaded end with swedging at the other end not shown which would automatically stop and locate the nut.