Porter, Robert D., <br/><br/>
A useful tool for winding and unwinding loop-end mainsprings / 
Robert D. Porter, CMW. 
 - 16 pages :  illustrations 
<br/><br/> This easy-to-make Mainspring Tool is like having a third hand for the clock maker, and makes servicing loop-end mainsprings much easier. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Clocks and watches--Design and construction.<br/>Clock and watch making--Equipment and supplies.
<br/><br/><label>Subjects--Index Terms: </label>Clock (general) Not Geographic The Author clock tools practical Porter, Robert Mechanics