老外的描述:
The 743 is at the top and the 845 at bottom. The barrel and threads is single piece on the 743 but is a two piece affair on the 845. The barrel being ebonite, Pilot made a seperate molded resin component that has the cap threads on the outside and the section threads on the inside. This component is then attached by some means to the barrel.
743的笔筒和螺纹是一个单个部件。但845是两个部件,笔筒是ebonite(硬橡胶),然后螺纹部分是个单独的树脂器件,外部是笔帽螺纹,内部是笔握螺纹,然后这个部件通过某种方式固定到笔筒上面
The inside of the Ebonite barrel is roughly finished and you can see the brownish tint of the already oxidised BHR. I tried, but it was too tough to photograph that area properly.