a device and a method for controlled setting of a coil spring , enabling a coil spring to be blocked in controlled manner with a selected compression length , in particular when compression with touching turns is unfavorable . according to the invention , the device comprises a first support configured to hold the first end of the spring and a second support configured to hold the second end of the spring , the first and second supports being configured to move relative to each other ; the device further comprising at least one insertable rest configured to be inserted between certain turns of the spring during compression of the spring .