The present invention relates to heart septal defect occlusion devices with adjustable length tether which can adapt the interseptal length of the device to the unique anatomy of the patient. When the produce is a cored lettuce head, the cored lettuce head is positioned in the holder with the cored portion facing the nozzle disposed across the horizontal distance. The post-transition display of legacy display pages is handled by the preferred embodiment through the use of a view registry that associates a defined display view with a legacy view engine and a legacy display page. The choke spool is comprised of an outer spool and a rotatable inner spool, both containing a plurality of bidirectional flow holes. The protein may inlcude signal peptides to target it.