sections 24 25 are received over adjacent corners of the filter plate 10 and the apparatus is thus secured in place by spring loaded locating screws 26 27 which are urged towards the filter plate 10 the filter plate 10 being retained between the rear walls only one of which 28 is illustrated of the box sections 24 25 and the end of the spring loaded located screws 26 27 a short tube 29 is received over the bar 21 such that it can slide along the length of the bar 21 a long rod 30 is secured to the short tube 29 a short t shaped rod 31 extending from the base of the long rod 30 substantially perpendicular thereto the short t shaped rod 31 may be pivoted about the bar 21 by securing the short tube 29 about the bar 21 in use the caulking tool is secured in position such that the end of the t shaped rod 31 is in register with the caulking rope 15 the end of the t shaped rod 31 may be used to urge the caulking rope 15 into position by pulling on the end of the long handle 30 so as to pivot the t shaped rod 31 towards the rope 15 and thus urge it into the groove 14 different parts of the caulking rope 15 may be urged into position by first moving the short tube 29 along the bar 21 and then appropriately moving the t shaped rod 31 into position the apparatus of fig2 is used to move the caulking rope 15 into.