I just redesigned the ring buckles on the chain and used adhesive to fix them, so as to achieve the locking of the chain. As for whether this is a good or bad upgrade, I'll leave it to you to judge for yourselves - I've specifically uploaded two sets of chains so that you can choose freely.

By the way, I also made some optimized adjustments to the ratchet gear. It seems that almost all the friends who have downloaded this model are equipped with a reaming tool, because no one has ever raised any objections to it.
To better secure the locking nut, I replaced it with a larger one that fits more snugly. During installation, all you need to do is gently press and twist it with your thumb to tighten it. This applies much more pressure than simply twisting it. If you accidentally "break" the post as a result, don't blame yourself too much - I've already printed a total of 20 such parts to ensure every step is done properly.

Although it took a lot of time, I've finally completed the thorough modification of this set of handcuffs! This time, I've given a comprehensive overhaul to the most outstanding handcuffs on this site so far. The original handcuffs had many issues: their structure was too flimsy, and even a slight pull or tug in any direction could easily damage the internal mechanisms. Additionally, the key design has been completely revamped, and with numerous optimized adjustments to various details, the strength of these handcuffs has been significantly enhanced, making them a true "hardcore" level of