During September 5 to 8, 1865  Gunn & Amidon participated in the  Second Annual Exhibition organized by the New England Agricultural Society in Concord, NH.

They presented two products - a wringer and a bit brace and receive recognition in a form of diploma. 

It is not clear if the brace shown there was Barber's brace or a new, Amidon's design.  It would seem logical that new brace of Amidon design was presented.

The success of braces did not stop Amidon from continuing improvements to his wringer. In August, 1865 he received another patent, No. 47,079, for Improvement in Wringing-Machine.

In the patent description Amidon said: "Wringing or washing machines are generally constructed with a bearings of one roller placed in movable boxes, which are free to rise and fall as the thick or thin body passes between the rollers. Some are constructed with two cog-wheels, one of which is attached to the end of the shaft of each roller. Others have no gearing at all. 

My invention consists in the manner in which I turned the upper roller by means of an endless chain or belt, operating in connection with three or more wheels, one on the end of the shaft of each roller and one or more attached to the frame-work of the machine."

Up to this point Amidon assigned both wringer patents to himself and never transfer them to Gunn & Amidon company.

In May 1867, Amidon received another patent for Improved Clothes-Wringer.  This time however, the situation was different.  Amidon assigned this patent to Bailey Washing and Wringing Machine Company of Woonsocket, Rhode Island.

In the description Amidon points out the most important feature as follows:

"The nature of my invention consists in so arranging a wringing machine having rollers composed of or covered with rubber or similar elastic material or compound impervious to water, as that the roller, which yields or gives to the varying bulk of articles that pass between it and the roller with fixed bearing, may move perpendicularly without strain upon the gearing which connects the rollers, and without causing the least alteration in relative positions of the gearing-wheels their immediate neighbors, while at the same time, from the peculiar construction of self-adjusting spring, the pressure of the roller upon the clothes is kept so nearly uniform during all degrees of elevation or depression of the roller that it may be considered practically constant."

On December 31, 1868 the factory of Gunn & Amidon at Cherry Rum Brook burned to the ground.

In 1892 the Greenfield Gazette, Centennial Edition published a short review of Millers Falls Company, including rare photographs of its facilities.

"The rapid growth of Millers Falls, which has made it one of the prosperous villages of Franklin County, has been due almost entirely to the Millers Falls company.

This company commenced business here in 1869. The promoters of the enterprise were Levi J. Gunn; Charles H. Amidon and Henry L. Pratt. Messrs. Gunn & Amidon had been engaged in the manufacture of bit braces, wringers, etc., in Greenfield, and their factory there was burned in 1868.

The water privilege and a considerable tract of land were purchased at Millers Falls. The original shop was a one-story brick building, 350 feet in length. There were also several small out-buildings. The plant has been enlarged from time to time, the shops now covering several acres, and having floor space of 75,000 square feet.

The extent and capacity of the main buildings may be seen in the accompanying illustrations. When a corporation was formed Mr. Amidon withdrew, and is now located at Buffalo, N. Y. The company was originally the Millers Falls Manufacturing Company, but in 1874 it absorbed the Backus Vice Company and became the Millers Falls Company. It has a capital stock of $200,000. The factory gives employment to about 300 hands.

The goods manufactured are machinists' and household hardware, beside many specialties. Leading lines are bit braces, breast drills, angular borers, chucks of various kinds, hand drills, automatic borers, angular drilling machines and various devices for boring and drilling; anvil vises, machinists' and wood-workers’ vises, jack-screws, Rogers, Lester, Goodell companion and cricket scroll saws, family tool chests, saw frames, carving tools, auger handles, hollow augers, family grind-stones, soldering sets, wood and iron levels, glass cutters, Crispin awls, screw drivers, hack and butcher saw frames and blades, mitre boxes, mitre planers, wagon jacks, nail-pullers, ratchet drills, wrenches, tool cabinets, and any other articles which may be demanded by the trade.

The goods are sold in all the markets of the world, no inconsiderable portion of the out-put being required for importation.

The business has been uniformly successful. The president of the company, Henry L. Pratt is located at 93 Reade Street, New York, where the company maintains a large warehouse. Levi J. Gunn has been the company's treasurer from the start, and George E. Rogers, the clerk, has held that position for several years. Much of the success of the company is due to the good management of these officials.

The following is the full list of officers: President, Henry L. Pratt; treasurer, Levi J. Gunn; secretary, Geo. E. Rogers; directors, Henry L. Pratt, Edward P. Stoughton, John L. Varick and George Munson of New York, Levi J. Gunn, Chester C. Conant, Geo. A. Arms, Edward E. Lyman and Geo. E. Rogers of Greenfield."