RTC 7005 SET - Set of 2 Shear Pins for Aeroparts Capstan Winch Aeroparts £28.40 Quantity: at £28.40 each Add To Basket 6 in stock. Set of 2 Shear Pins for Aeroparts Capstan Winch Set comprises one of each brass and steel shear pin. The brass shear pin is for the operational use of the capstan winch. If the engine has to be turned over by hand for any reason, i.e. starting or setting the timing, the steel pin should be used as there is a danger the brass pin can be sheared.