This is where the dimensions of the upper tube holder shown in Photo0068 are discussed
Inital impressions the tube holder is about 1/4 inch thick and 4.45 to 4.5 inches in diameter
The holes need to be slightlly larger than the outer tube diameter to allow for easy insertion and possibly vibration
The center hole may be there to allow better circulation of water and to prevent any bubbles formed
outside the tubes to rise freely
Calipers 365 and 122.
rnd .25 dim<val>4.42
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argument 365:122::4.5:<val>
1.5
The dimensions of the upper tube holder are as follows:
4.5 inches in diamenter for .125 gap with Cell Housing
4.75 inches for tight fit
1.5 inch center hole
0.75 or slightly larger for outer tube insertion
There are 9 holes drilled for the outer tubes
The center of the hole is spaced radially at 40 degrees (360/9)
********
179:98::0.75:<val>
.41
rnd english .125
.375, 3/8 inch
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The center of the hole for the tubes is 0.75 from the outer edge of the upper tube bracket.
There are semi-circular cut outs along the edge of the upper tube bracket to possibly allow for better water or gas circulation. They appear to made with a .75 drill
Again 40 degree radial spacing but shifted by 20 degrees from the tube holes
The ID of the 5.5 Cell Housing was 4.75"
Stan probably fabricated a disk 4.75 inches in diameter
A standard 1.5 " hole saw was used to cut the larger central hole
He then measured out a distance of .5 inches
Then he drilled the 0.75 inch holes for the outer pipes ( which makes the center of the outer tube
2.375 inches from the center of the Upper Tube Bracket)
That leaves about 0.375 inchs between the Cell Housing wall and the outer tube.
He may have just rasped or sanded the outer dimension to make a close fit.
.75+.5+.75+.375= 2.375
2.375 x 2 = 4.75 which equals ID of the Cell Housing
Alternatively he could have reduced the .5 measurment by .125 to give . 125 clearance for the Upper Tube Bracket with the Cell holder wall.
Based on Photo0068.jpg graciously posted by Dynodon
