EX2015 Trolley Dolly for... €280.00 Trolley for a Laser ® based upon the same proven quick release system as used on our Optimist trolley. EX10790 Trolley spring clip €4.00 Spring clip for securing the trolley wheels. ΕΧ1079 Spare Pneumatic... €26.00 Spare pneumatic trolley wheel with a diameter of 40.5cm for the Optiparts Optimist trolley. EX10791 Trolley spring clip €3.30 Galvanized trolley spring clip for securing wheels. EX10786 OPTIFLEX-LITE Wheel... €30.00 Large Optiflex-lite puncture proof wheels for Optiparts Optimist trolleys, with a diameter of 37cm.