I bought some Tecnacraft turnbuckles off E-bay from Hong Kong.
They are not 4-40.
The diameter at the threaded section of an original Tecnacraft Turnbuckle is (4-40) or 3mm which fits
the Team Associated #6274 ball cups perfectly.
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LX2549&P=7
The ones from Hong Kong are close to 3.5mm and are just too hard to fit the ballcups and when I did
get one on the ball cup was distorted.
Cheers, Dave.
