Normal retraction. Pin diameter 8mm. Sizes, drawings and more info: Genesis40.pdf.
NOTE: These retracts need a special electronic controller LGC12S to operate. To be ordered separately: https://www.xicoy.com/catalog/product_info.php?products_id=265
DO NOT CONNECT THE RETRACT DIRECTLY TO A BATTERY. MOTOR WILL BE DAMAGED. NOT COVERED BY WARRANTY!