I saw a video on you tube that make me think...
A man do a ground loop due to a tail spring failure.

One question, my problem his different for example if i make a 180° turn on the runway to align my KF to take off sometimes my tailwheel unlock and i lose my rudder control.

I've got i think the original Matco wheel and i heard the are good but need lots of overhaul. Is it difficult to set, perhaps my springs to strong ?

Thanks