Method and device for determining connector size and assembling conductor and connector

A device for engaging and holding a conductor cable formed of multiple strands in a tight column and for matching and assembling the conductor with a connector to achieve a reliable connection comprising a barrel having an interior chamber, an open front end and an open rear end, a plunger inserted through the rear open end in telescoping relation with the barrel, means for biasing the plunger toward said open rear end to an articulated position with respect to the barrel, a band attached to the plunger and passing through the front open end of the barrel to define a loop immediately outside the barrel, the plunger being operative to expand and contract the loop for engaging the circumference of the multiple strands of a conductor end, the loop together with said bias means being further adapted for gathering and holding the multiple strands into a tight column for insertion into a connector, and the plunger having indicia directly specifying the particular connector to be used with the conductor held by the band, whereby the tight column of conductor strands held by the loop is inserted into the specified connector.