4 b in fig3 better illustrating inner surface 39 axially below finger 30 fig5 is a perspective view of an example embodiment in context with collar 200 for an aerosol canister bushing 100 is in an uninstalled position meaning bushing 100 has not been pushed downward to permanently lock collar 200 to an aerosol canister in the uninstalled position bushing 100 is resting in collar 200 with top surfaces 32 of locking fingers 30 above top surface 206 of shelf 230 labeled in fig1 top surfaces 22 of walls 20 are also above top surface 206 of shelf 230 however walls 20 are contained within collar 200 by shelf 204 as will be seen in fig6 and 7 locator ribs 15 are below shelf 206 for proper installation of bushing 100 into collar 200 bushing 100 must have one of locking fingers 30 facing the front of collar 200 before bushing 100 can be being slid into place and lock this is due to collar 200 having a plurality of receptors positioned within the cylindrical opening to allow locking fingers 30 to snap outward into the receptors within the cylindrical opening can be configured in any circumferential pattern and bushing 100 can be manufactured to have locking fingers 30 in a corresponding configuration for example two or four or more locking fingers can be used if a cylindrical opening or housing has two or four or more receptors positioned to receive the locking fingers in the example embodiment shown in fig5 a receptor is arranged at the front of collar 200 so one of locking fingers 30 must be.