roundhouse WILLIAM Owner's Handbook Manual page 14

Slacken the screw retaining the jet block and slide it out to the rear. Remove
the jet from the jet block using a 4BA spanner. Wash out the jet in fast
evaporating thinner (Cellulose or similar). Blow through the jet from the
front, which should clear most blockages. Although the hole through the jet is
tiny, if you hold it up to the light you should be able to see quite clearly if it is
blocked or not. If in doubt, fit a new jet. A spare gas jet is included with the
toolkit. Do not use wire to clean the jet as this can damage the precision hole
and may upset the delicate balance of the gas system. Reassemble in the
reverse order, putting a small amount of PTFE tape round the thread of the jet.
Ensure all connections are tight. When re-positioning the jet block in the
burner, ensure that it is pushed in as far as it will go.
The gas regulator has a spindle 'O' ring housed inside the body which may
need lubrication from time to time if the control becomes 'spongy' in
operation, making precise gas control difficult.
As stated in the lighting instructions on page 8, the full range of adjustment
for normal burner operation is achieved within the first full rotation of the
regulator knob, and it should only be unscrewed more than this for
maintenance purposes and when the tank is empty, and their are no naked
lights nearby.
To lubricate it, remove the knurled knob which is retained by a 4BA socket
grub screw (.100" AF Allen key required) in the side.
Beneath the knob is a back-lash spring and white PTFE washer which will
slide off the spindle.
Unscrew the hexagon retaining nut then screw the spindle out of the body.
The 'O' ring can now be lubricated.
Replace the spindle followed by the retaining nut. Slide the white PTFE
washer and backlash spring over the spindle and replace the knob. Note that
the grub screw that holds the knob in place tightens into a groove near the end
of the spindle.
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