Hi. After isolating the gas I removed my old cooker. I prepared what to do to install the new one (instructions, advive, non setting gas sealant and leak check spray). However; one end of the gas hose (to the gas supply) is a bayonnte connection (no probs), the end to the cooker is a screw thread. The problem lies at the screw thread end. On the old cooker the hose fully screwed into the cooker upto the tightening nut. On the new cooker it only screws in 3/4 of the way. This says to me i need a shorter screw thread however in the instruction manual (cooker) it says "connect hose to rear of cooker (1/2 in BSP)". This has cast doubt in my mind, so any advice would be great.