I recently got started fettling my PL53. The first thing I tried was investigating whether the pump and vaporiser were working. After giving it a few pumps it became obvious that the vaporiser was totally blocked as when I removed it, fuel bubbled up from the control cock. I could also see that the control mechanism was working perfectly. I heated the vaporiser to cherry red,quenched it and repeated this a few times until gunk began falling out. Then the spring loosened and came out followed by yet more charred remains. After half an hour of this, I finally managed to get air flow through the vaporiser so I renewed the seal and tried a few pumps and sprayed the kitchen with a fine jet of paraffin. So far so good. My first question is, the hood has a few rust holes. Will this affect the airflow or cause other problems? My second question is, are the air buttons too corroded to function in their current state (see photos below). I have looked at the burner and removing them without causing considerable damage seems unlikely - not impossible but very time consuming and prone to failure IMO - but what are the chances that I'll get the burner to work as it is?