The item you circled is a lower link arm to be held in alignment by the two 1/4 x 2 x 14 jig pieces for the purpose of welding. The jig is used for welding each lower link arm and also for welding the upper link arms.
By using the jig I found it simple to end up with all four links that fit together without any modification and makes parts that are interchangeable (left to right). With the jig you can make replacement links which are exact fits.
By all means use a regulator on 20# and larger propane tanks. You are dealing with about 100# pressure and only need a few lbs at the torch. Torch needs to have the right orfice for propane and a propane hose not acetylene. Propane will breakdown acetylene hoses because it contains petro compounds. Notice that all BBQ units have regulators (non-adjustable).
Ted
Macbruce,
The last two photos answered my question about the mounting. Thanks.
I am impressed with your last video. Were you using the extra 15 lb weight in this case?
Ted
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