I don't know which threads those have. I think its the same as the Steez, TD Zillion, T3 ect from that era. Those make use of a clicker that also acts as a retainer. Without it the knobs will back off. I have one on my old Tatula HD which uses the same threads but no provision for a clicker. Its always backing out.
You have options if these threads are the same as old Steez, TD Zillion, T3, Zillion SV and Alphas.
A knob for the old Steez, TD Zillion and T3 and some thread tape to keep the knob secure. You can also use lock tight on the knob threads and then it cure off the reel (this is key) and then thread the knob on and the reel threads will cut into the lock tight on the knob and hold secure. Constant adjustment of the knob will make it loosen over time. This is best for set and forget spool tension. The advantage of this is that it allows you to use clicker or acorn style on a reel with compatible threads but no provision for a clicker. These are considered classier, better looking knobs than the old cylinder type. They are hard to find from Hedgehog but Aliexpress has DIY ones.
This style on an old Tatula. No clicker provision so knob loosens over time.
Old style cylindrical knob like yours but in other colors. I believe Pixy and old Alphas also use the same knobs and come in colors. Amo sells color ones for the Alphas and others can be tracked down as well. Old Tatula Type R (non CT) also uses this nob in red.
Amo
Tatula Type R knob on a TD-S 105
Tatula HD Custom knob. These are an acorn style non clicker knob. They look like a high end modern Daiwa non zero adjust knob but don't make use of a clicker. They're just shaped to resemble one. I have a gold trim one on my TD-X and a red trim one on my old Tatula Type R. They are heavy but look cool. Good way to give a non clicker old Daiwa a clicker acorn style knob. These are not sold individually. Mine came from parts swapping.