792 AutoCAD and Its Applications—Basics Copyright Goodheart-Willcox Co., Inc. Repeat the previous sequence to assign a second stretch action to the opposite side of the bolt head. Test and save the block, and exit the Block Editor. The dynamic block is now ready to use. Figure 26-14 illustrates using the lower grip point or dynamic input to stretch the bolt block reference. Use either grip to stretch the bolt head. You can also use the Properties palette to defi ne the distance. Assigning a Scale Action Figure 26-15 shows a block of a vanity symbol that includes a sink. In this example, a scale action is assigned to a linear parameter to adjust the size of the sink while maintaining the dimensions of the vanity. Activate the Linear parameter option and use the Base option to select the Midpoint setting. Next, use the Label option to change the label name to SINK LENGTH. Select the start point and endpoint of the linear param- eter to defi ne the parameter and automatically calculate the midpoint. This example uses two quadrants of the sink. After you select the start point and endpoint, pick a location for the parameter label. Next, select the number of grips to associate with the parameter. The Figure 26-15 example uses the default 2 option to create grips at the start point and endpoint. scale action: An action used to scale some of the objects within a block independently of the other objects. Figure 26-13. Assigning a stretch action to one side of the bolt head. A—Create a crossing window around the top of the bolt head. B—Select the objects to be included in the stretch action. Stretch frame Pick to assign action Individually select items shown in color B A Figure 26-14. Dynamically stretching the bolt head. Notice that the head stretches symmetrically. Upper part of the bolt head is stretched the same amount as the lower part Linear parameter stretches equally on both sides Selected parameter grip