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To remove the heart, look back at the case where you will see a lever. Gently spread the legs of the lever and remove it. Turn the regulator so that the poppet will fall out of the adjuster hole. Now, you can finish removing the orifice by pushing a plastic stick (steal a stick from your kid's toy CONNECTS) down the barrel from the adjuster hole.
couv
If I remember correctly, my AOW instructor down in Roatan was diving an R109 without an exhaust "Tee" on his.
What bad can come from this other than bubbles in your face?