Related for Menachot 82:6
איתמר רב אמר אין מתירין מבגד לבגד ושמואל אמר מתירין מבגד לבגד
if, however, these were inserted, it is, nevertheless, valid!<span class="x" onmousemove="('comment',' Thus in conflict with the Baraitha which absolutely excludes imitation blue.');"><sup>6</sup></span>
Tosefta Beitzah (Lieberman)
R. Shimon says: One may have a bed, a chair, a bench or pull up a chair on the Sabbath; and one don't even have to say: on a holiday.
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Shulchan Arukh, Orach Chayim
The number of the Tzitzit threads on all corners is 4 strings folded over, which is 8. If more were added, they are invalid. You should trim the tips of the 4 threads then insert them in the corner. Finally, double them over and then there will be 8.
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