Simmer?  You need one or more of these:
http://www.kitchenworksinc.com/Tinned-Steel-Heat-Diffuser-with-Wood-Handle__
131276.aspx

Sooner or later you will burn the handle off, but no matter.  I have four,
and use them under my cast iron griddle as well.

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
David Beierl
Sent: Tuesday, July 01, 2014 8:39 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Propane modification to my campsite meat smoker

At 10:16 PM 7/1/2014, Alistair Bell wrote:
>Oh, I see, not a screw in assembly like some.
>
>Is the jet, or orifice removable?
>
>Alistair

Meantime, his research pays off for me.  I've got that same stove and it
simply *won't* simmer.  I also have a Cadak stove that's extremely clever
but likewise doesn't like to simmer; but on that one it's a valve needle on
the end of a fine-threaded shaft that the knob is at the other end of.  If I
hold my mouth right I can get it down to a simmer without going out.  Takes
a few tries sometimes.  I'm skeert to mess with the needle.

Cheers,
David