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Model 1040/1050Non handedSized spring (2-5)Identified by # near shaft1040: No backcheck1050: Backcheck

Model 1070Non handedSized spring (4-5 & adjustable)Identified by # near shaft1071: Adjustable spring tension

Model 1371 - DISCONTINUEDNon handedAdjustable spring tension (1-5)Identified by # near shaftMounted on bracket

Model 1460/1461Non handed1460: Adjustable 2-61461: Adjustable 1-6Identified by # near shaftPlastic cover

Model 4010/4011Handed4010: Adjustable 2-64011: Adjustable 1-6Mounted on pull sideIdentified by # near shaft

Model 4020/4021Handed4020: Adjustable 2-64021: Adjustable 1-6Mounted on push jambIdentified by # near shaft

Model 4110/4111Handed4110: Adjustable 2-64111: Adjustable 1-6Parallel mount / push sideIdentified by # near shaft

Model 4040/4041Non handed4040: Adjustable 2-64041: Adjustable 1-6Six-sided shaftIdentified by # near shaft