There appear to be several types of T-Craft stringers. Many folks purchase off-the-shelf "T" style stringers from Aircraft Spruce and they work fine except they are expensive and unnecessarily heavy. I believe mine are the original style..simple spruce strips, 1 inch wide and tapered in thickness from 3/8 to 1/4. You can easily make a whole airplanes worth in a few minutes with a table saw and some scrap spruce (old wing spars?) Simply rip your spruce stock into 8-1" X 3/4" strips, then rip each strip again with the table saw blade set at about 10 degrees. Each spruce strip yields two tapered stringers.
They are secured to the fuselage frame with cotter pins.
At the door frame with steel angles (.050 thick 4130 steel... drill, bend, paint) Note the door frames are also made of recycled spar material.
And the stringers are attached to the frame at the aft end with anti-chafe tape (cloth, adhesive tape). Give the tape a couple coats of epoxy varnish.
Link to Wood Recycle
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