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On channel bolts I used a rotozip angle grinder with 1/16" metal cutting blade, nice angle cut through both bolt/nut until they simply fall apart. Very satisfying.
On doing blind floor attach, with belly pan on? Later Airstreams (My '73) used this type of floor fastener, I pre-drilled pilot holes and used a countersink bit on the plywood to accept the flat head - if you use these be gentle seating the screw, not much metal in the spars and I had one out of fifty or so strip the threads. The cutter-wings shear off on contact with the metal, I did not use them & snapped them off before setting fasteners.
It would be okay to increase the number of screws per spar, 8 or 10 inches apart, etc. etc.
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The days are short and the night is long and the stars go tumbling by.. . ~Airstream~
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