Once the nib has been prepared it is important to set it up correctly. Some nibs are purchased with a reservoir, but reservoirs for the William Mitchell Square Cut nibs and Leonardt Square Cut Nibs are purchased separately and have to be fitted to the nib.
Reservoirs are usually made of brass making them flexible enough so they can be adjusted. It is important to fit the reservoir correctly otherwise it can cause problems. If the reservoir is fitted too tight it can affect the tines of the nib causing scratchy pen strokes. If it is fitted too loosely it will fall off (usually down the sink or in the bottle of ink!). The fit needs to be such that the reservoir stays on the nib but could quite easily fall off.
The reservoir can be adjusted by using both thumbs to adjust the little wings that wrap round the nib.
It is usual that each time you fit a reservoir you will need to adjust it for the nib. Now the reservoir fits the nib correctly you need to make sure the tip of the reservoir is just touching the nib. Often it is necessary to bend the point of the reservoir a little.
Once the reservoir has been attached to the nib you will see a gap between the reservoir and nib. The tip of the reservoir should be touching the nib.
Now the reservoir needs to be positioned correctly on the back of the nib. The position of the reservoir will control the ink flow. Start with the reservoir about 2mm away from the tip of the nib. If the ink does not flow very well, slide the reservoir a little closer to the edge of the nib. If the ink flow is too great, reduce the flow by sliding the reservoir away from the nib.