An electric motor field or stator core slot insulating liner having a lead enclosing channel structure receives, and during coil winding holds, an insulated stator lead with one end slightly projecting for splicing thereto of a corresponding coil magnet wire end after completion of coil winding. The spliced lead end is drawn into the channel, thus affording splice insulation and lead anchoring; any subsequent stator impregnation with insulating varnish contributing to splice insulation and to lead anchoring effect of magnet coil pressure against the liner and channel. After winding lead insertion at times is preferable.