Bosun Higgs
N/A
The bits came from bes ltd - on the net. spec of the bits has previously been covered on the forum as has the procedure. Just take care. Do the job in the open air, away from any source of ignition. Have an accurate set of scales and dont fill the cylinder more than 75%. There are other safety issues so if your skills arent practical science / engineering ( an arts graduate for example) then dont try it.
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