How to solve the problem of lateral and vertical looseness of the tsuba and kiriha seppa parts of the samurai sword?

[LEE1989]

 

Hello, seniors! I am a novice-level katana enthusiast. Due to my lack of knowledge, I have many questions to ask you. I have recently collected some antique katana, but it seems that the problem described in my title is common. I would like to ask the following questions:
1 If the appraisal certificate of the Japan Art Sword Association does not mention the katana's accessories, can it be understood that only the katana itself was appraised, and the matching accessories are likely to be added later, rather than the same period as the katana itself?

2 If there is only one hole on the handle of the katana's accessories, and the katana itself has two holes, can it be determined that the katana's accessories were added later?

3 Is this phenomenon common in current katana transactions? I have seen very high-level katana with two appraisal certificates, one for the katana itself and one for its accessories. For a transaction, is this phenomenon normal or is the seller responsible?

4 How should I deal with this problem if I want to solve it?

Below is the latest knife I received. It is obvious that there is a large gap at the tsuba position, which is the reason for the looseness after assembly.

[Jacques]

Blades and koshirae must be judged differently

[Brian]

It is rare to find a sword with original koshirae. These were changed often over the life of a sword, and almost always you can consider them as replaced at some point. Not a big deal. The 2 holes means it was remounted at least once, and they drilled a new hole...again extremely common. The blade is usually the important part, the fittings are secondary unless they are very high quality. Find a restorer who can add sekigane to your tsuba to tighten it up. Not a very difficult job.
If a sword comes with a very good tsuba, very often it will be swapped out for another one when selling.
Don't worry too much about your fittings.

[LEE1989]

5 minutes ago, Brian said:

很难找到带有原装小镡的剑。这些镡在剑的使用寿命期间经常更换，几乎总能算作在某个时候被替换过。这没什么大不了的。两个孔意味着它至少被重新安装过一次，而且他们又钻了一个新孔……这种情况也非常常见。刀刃通常是最重要的部分，除非配件质量非常高，否则配件是次要的。找一位可以给你的剑镡加镡（sekigane）来固定它的修复师。这工作并不难。
如果一把剑配有一个非常好的剑镡，出售时通常会被换成另一个。
不必太担心你的配件。

Got it, thanks a lot for your advice, it seems hard to find craftsmen in Sydney.

[Rayhan]

1 hour ago, LEE1989 said:

Got it, thanks a lot for your advice, it seems hard to find craftsmen in Sydney.

You're closer to Japan, send them there if they are high value items (5k USD or above). Otherwise I'm sure members here can guide you to local craftsmen in AUS.