position of the collar 46 also disposed upon the threaded shaft 44 is a second nut 50 a spring 52 is disposed about the sleeve 42 and a portion of the plunger 38 intermediate the collars 40 46 a bracket 54 is secured to the base 12 by bolts 56 the bracket 54 has an opening 58 therein with a cylindrical guide 59 intergral therewith a piston 60 is received within the guide 59 and extends through the opening 58 the piston 60 has a slotted end 62 that receives an arcuate arm 64 the arcuate arm 64 is supported within the slot 62 by a pin 66 a handle 68 has an elongated slot 70 that receives a projection 72 of the bracket 54 the handle 68 is pivotally mounted to the projection 72 by pin 74 and the arcuate arm 64 is pivotally supported by the handle by another pin 76 this construction allows the plunger 38 to be moved toward and away from the fixture 20 by pivoting the handle 68 in a clockwise or counter clockwise direction respectively the plunger 38 will be locked when the handle 68 is in its maximum clockwise position referring now to fig2 a transducer body 78 to which a strain gauge is to be attached is placed next to the fixture 20 a layer of adhesive 80 is applied to the transducer body 78 and a strain gauge 82 is placed over the adhesive layer a resilient pad 84 is located between the strain gauge.