If you need a case, add 1000 yen. Please comment. Receipts are not issued. Please do not purchase if you are slow to rate or do not rate the item. Those with low ratings or first-time transactions may have their orders canceled. Used items are non-refundable and non-returnable. Please refrain from price negotiations. In the 13th photo, the center field is what was attached. The resin is slightly melted. The one on the right looks bad, but both work normally. I noticed this after disassembling both. I purchased both as working, confirmed they worked without issue, and then disassembled them to find they were burnt. It takes time for them to completely fail, so you won't know unless you disassemble them. HR1841F has a high probability of field burning, so even if the operation is confirmed, you won't know unless you disassemble it. Recently, I purchased 10 units, and this is the 4th one with a burnt field. That's a total of 8 units. In the 14th photo, the items on the left and right have armature that are burnt. They are discolored and deformed. The center one is what was attached. It is not discolored or deformed. There are no abnormalities such as discoloration on the armature. I don't think the temperature rose. Therefore, in the 15th photo, the armature has not been replaced. You can tell when the armature is bad because the rotation becomes very slow. The protrusions on the commutator part from when it was new are clearly visible. The protrusions are triangular, so you can tell by the thin copper color and the wide black area. It's close to new. The code has printing on it. There is no year. It has both luster and elasticity. In the 16th photo, grease is rarely leaking, so I have not disassembled the gear housing or replaced the grease. In my experience, grease leaks in over 90% of cases (including those in new condition). In the 17th photo, I disassembled it, but it wasn't very dirty. It seems the usage time was quite short. Disassembled and cleaned. Forward, reverse, and concrete drilling have been confirmed. In the 18th photo, it's the field after drilling 10 holes of 10φ and 40mm deep, one after another. No abnormalities were found in either the field or the armature. I cannot guarantee that the armature is okay. This is only a visual inspection. There are scratches and dirt due to it being a used item. Please purchase only if you are satisfied.