the plate 54 abuts the medial brace 60 to urge the platform extension 12 outwardly from the fixed platform 58 the plate 54 abuts the outer brace 66 of the platform extension 12 to urge the platform extension 12 inwardly to the fixed platform 58 in use the bracket 18 and post 40 may be installed on a pre existing paver 14 or provided as part of the original manufacture of the paver 14 when added to an existing paver as the platform extension 12 is typically a pre existing component of the paver 14 the medial brace 60 is added to the platform extension 12 at the desired position to create lag in the movement of the platform extension 12 relative to the laterally extendable paver mechanism 16 the device 10 thus automates extension and retraction of the platform extension 12 corresponding to extension and retraction of the laterally extendable paver mechanism 16 guides such as rails and stops or the like conventionally used and provided with a pre existing platform extension are not shown with respect to the above description then it is to be realized that the optimum dimensional relationships for the parts of an embodiment enabled by the disclosure to include variations in size materials shape form function and manner of.