12 therein the grommet bottom portion 27 has a tapered end portion 29 to facilitate easy installation of the grommet 23 into the opening 24 by deforming the bottom portion 27 of the grommet as it is inserted into the opening 24 from the top down the sleeve 21 is more clearly shown in fig3 to include a tubular portion 31 with a discontinuity 32 which allows the tubular portion 31 to flex in a spring like manner to an expanded condition when the stud 19 is inserted into the inner cavity 33 of the sleeve 21 the sleeve 21 is preferably made of a suitable metal material which provides the desired strength forming and flexibility characteristics that will serve the intended function of the invention a metal which has been found to be suitable for this purpose is spring steel the sleeve tubular portion 31 has a plurality of outwardly extending protuberances 34 and inwardly extending protuberances 36 as shown these can be formed for example by cutting a three sided opening 37 in the tubular portion 31 to form a tab which is then bent outwardly or inwardly from the plane of the tubular portion 31 for purposes of gripping the inner walls of the grommet 23 in the case of the outwardly extending protuberances 34 and for gripping the threads of the stud 19 in the case of the inwardly extending protuberances 36 it will be seen that in the case of the outwardly extending protuberances 34 the opening 37 is cut nearest the end 37 into which the stud 19 is inserted such that when the tab is bent outwardly it extends toward the component i e the accumulator that is attached to the stud in this way.