An apparatus and method for cleaning a webbing-up device in a printing press is disclosed. The insert is fittable in the cavity and pivotal about the pin between an open position largely outside the cavity and a closed position contained in the cavity and with the edge region fitting in the cutout. ; an aqueous dispersion obtainable therewith; a photothermographic recording material prepared with the aqueous dispersion; and a process for preparing the photothermographic recording material. Deployment of the anchor within the right ventricle may be performed by inserting a guidewire through the septal wall into the right ventricle. The wall acts to define a guide area to guide a flexible probe extended from a side branch vessel to enter the fenestration or low profile side arm. In order to achieve high growth rates, preferably a dual growth zone reactor is used in which a first, high temperature zone is used for crystal nucleation and a second, low temperature zone is used for rapid crystal growth.