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Creating Angle Braces:
1. Eight angle braces (four for each end of the tunnel) must be made from four pieces of 1-3/8" top
rail. These pieces should be about 5 ft. long (exact length is not critical). Do this by cutting the
swaged end off the top rail and then cutting it in half.
2. Flatten the ends with a large bench vise or hammer; ensure that the
‘flats’ face the same direction.
3. 'Dog ear' cut both corners off each end.
4. Pre-drill each end with a 5/16" drill bit.
5. De-burr any cut ends of the pipe and
pre-drilled holes using a hand file, die
grinder, or bench grinder. It may be
necessary to ream out the holes after
deburring by re-drilling.
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7617.999 Rev 06/21/2021 | AL, JG, ms