board 10 the alignment holes 38 see fig3 of the ribbon cable 18 alignment holes 58 and 60 in the compression mat 40 and the restrainer member 46 respectively and the holes in the clamping plate 20 the exposed outer portions of the threaded bolts 52 are threaded through the holes in cap elements 56 and nuts 54 are screwed on to the bolts 52 the nuts 54 are then tightened to compress the compression fingers 42 so as to force the contact members 32 tightly against the contact pads 26 compression mats with compression fingers are commercially available from intercon systems inc of harrisburg pa as part of their c byte u2122 connector system alternatively the compression mat 40 can be made by injection molding from for example thermal silicon rubber other suitable materials include polyurethane flexibilized epoxies and thermoplastic elastomers the restrainer member 46 can be made by placing the restrainer member 46 in a tray and then filling the tray to a suitable height with a polyurethane compound that has been heated to for example 60 u00b0 c the polyurethane is not poured over the compressor fingers 42 themselves but is instead introduced through a nozzle at their base and allowed to rise to a suitable height a suitable polyurethane compound is commercially available from chemical innovations limited of preston england under their trademark monothane a30 after it is poured the polyurethane can be cured by heating it at approximately 150 u00b0 c for about 2 hours the inventors have confirmed the effectiveness of a restrainer member made as discussed above in an experiment the results of this experiment are shown in the following table in this experiment the force initially required to compress the compressor fingers by 31.