An adjustable attachment for an applicator box to attach a handle, the adjustable attachment including a mounting plate for attachment to the applicator box having raised portion defining an enclosure between the raised portion and the application box, the enclosure accessible from at least one side, and attachment portion to attach to the handle, and a clamping assembly to clamp the attachment portion to the mounting plate and including at least one threaded member associated with a thumbwheel, rotation of the thumbwheel moving the clamping assembly between a clean condition which at least temporarily fixes the application box and handle relative to one another and a free condition in which the applicator box and handle are movable in relation to one another.