I recently aquired and Tilley 'hybrid' A PL53 base with a 246 Hood & Burner with a home made glass cage. I have cleaned and flushed it through, but have a burning issue..... Lights beautifully as shown in the picture, but after 10 minutes running the burner starts to glow cherry red and the light output dims considerably whilst still holding good pressure I have swapped the burner and the hood with newer stock but the problem remains. The only way I can get it to run brightly for any length of time is to run the burner without the hood and glass. Any suggestions?