I send you a pr. of Pen-arms with Screws for the Movement of the Pen-tubes, and also springs about equal to the additional weight of these arms. I have sent these things, under the Idea that you would not have much difficulty in taking off the old arms of your Polygraph and placing these, should you like them—However if you prefer sending me the Polygraph and the new arms, I will fit them, and without loss of time return it. Although I have a tool to give an exact form to all the arms we make, yet sometimes in puting the machinery togather it is found necessary to give a different set to one of them, inspite of all our exactness of Workmanship, and I expect the screw tubes will more especially require some adjusting of the points of the Pens, I mention this least you should be discourged if you found some incorrectness with the new arms. I am sory to give you so much trouble as you must have in either puting this machinery togather, or in repacking & sending the Polygraph here, I am very desireous to make this usefull Instrument exactly as you would wish it and therefore your commands will oblige your friend