help , ive bought a pre owned paddler as shown in another thread on this site , however im having problem putting the grub screws into the central bosses to hold the paddles onto the driveshaft . the wheels themselves are approx 70 mm in external diameter , and made from plastic , red for the "wheel" with 6 black blades , the central bosses are about 6mm dia with a 3mm bore . do any of the more knowledgable paddler modellers know which wheels are fitted please ? kev