The defendant has asked for corrections and additions to this finding but no correction is permissible by which the position of the defendant will be materially benefited. The terms of the contract between Rosen and the defendant are determined by the constitution and bylaws of the defendant as existing when he became a member and as amended from time to time while he continued as such. O'Brien v. Brotherhood of the Union, 76 Conn. 52, 57, 55 A. 577; Gilmore v. Knights of Columbus, 77 Conn. 58, 62, 58 A. 223; Masonic Mutual Benefit Association v. Severson, 71 Conn. 719, 724, 43 A. 192; Coughlin v. Knights of Columbus, 79 Conn. 218, 220, 64 A. 223. "It is the time when dues become payable, not the month for which they are paid, which must determine whether a member is in arrears for more than three months' dues." Cunningham v. United Association of Journeymen Plumbers, 114 Conn. 309, 312, 158 A. 807. Having paid the dues within the time required by the local union, which was not contrary to any provision of the constitution of the parent union, it follows that the plaintiff as the designated beneficiary was entitled to the benefit of $300 established for a ten-year membership.