Spring Barrel Clock Repair


Next Workshop Dates: March 15 - 18, 2019

From 9AM to 5PM

Click here to register online

Prerequisite(s): CR-100

Introduction:This 4-day course will cover clock movements with two spring barrels (mainsprings enclosed in spring barrels not open). Clock movements with two mainsprings from America, England, France, and Germany are good projects for students to repair. These movements can be either count wheel or rack and snail strike systems. 

What you will learn: Basic skills from Clock Repair 100 will be reviewed. In addition, appropriate nomenclature specific to spring barrel clocks, as well as new skills in mainspring and spring barrel tooth repair and rack and snail strike adjustment and repair will be covered. Students will learn to use mainspring winders, clock timers, and to measure and calculate the strength of replacement springs for spring barrels.

What you will need:

Clock movement (IMPORTANT!!!): Students must find and bring one or more two train rack and snail movement(s) with main springs in barrels, with them to work on in the class - movements will not be provided. Movements must include all parts including pendulum, springs, suspension springs, etc. These are routinely available through eBay or inside English or German mantle clocks for sale at local antique stores. Enfeild and Smiths are two English makers that are plentiful.

Note: Please bring a movement with potential for being repaired - i.e., no basket cases. If you have any questions please call the instructor (Mark Vozar @ 817-399-9894).

Tools: Tools: It is recommended that the student bring the following tools to class. Try to bring as many of the non-clock repair specific tools as possible. The Chapter has kits available for use during class containing the clock specific tools and any other tools or materials you will need to complete the class. So if you want to try your hand at Clock Repair before purchasing a lot of equipment you may check out a tool kit. Please call/email the instructor if you have any questions.


  • Pencil and paper to take notes.
  • Lamp for mounting to table.
  • Paper towels (roll).
  • Box to hold movement and parts - e.g., plastic shoebox with cover or cigar box.
  • Pliers, small set: flat-smooth nose, long nose and diagonal cutters - Buy good quality here.
  • Screwdriver: 6" x 1/8" slotted. (Jeweler's set works well).
  • Tweezers (6 to 8 inches long).
  • Vise, a quality 2-1/2" is ideal with an anvil. (Palmgren drill press vise is idea - available through Amazon.com or a variety of vendorsl).
  • Wrench: Small adjustable (or nut driver set).
  • Eye loupe, 2-1/2 power is ideal. Optivisor is a good brand.
  • Files: 4" or 6" set of jeweler's files to include a barrette file (a short thin #2 or #4 cut with one safe side).
  • Hammers: Small ball peen and a brass head.


  • Mainspring "C" clamps (2; preferrably flat) - equivalent to Timesavers part #20082.
  • Movement holder (hanging assembly post kit) - equivalent to Timesavers part #13409.
  • Dip oilers: equivalent to Timesavers part #13428.
  • High quality clock oil: Nye oil or equivalent (the smallest bottle is fine).
  • Pivot locator - equivalent to Timesavers part #20261; there are also sets of pivot locators available from various vendors).
  • Letdown key set with handle - equivalent to Timesavers part # 10066).
  • Stand to test your clock following repair - equivalent to Timesavers #19996).
Note: You should decide on the quality of tools you want.  There are high quality (more expensive) and economy (lower cost) tools - you usually get what you pay for.  When purchasing higher quality hand tools look for brand names such as:  Bergeon, Dumont, Swanstrom, Lindstrom, Corradi, Grobet, and Peer-Vigor.  Sears-Craftsman brand is also good and guaranteed.  Economy tools are usually made in China, Pakistan or India - the steel is soft.

Note:  In addition to course registration, a lab fee of $20 will be collected on the first day of class to help defray the cost of Chapter tools and student materials used in the workshop.

Instructor: Mark Vozar


Page revised Februrary 2019.

Copyright © 2019 Lone Star Chapter 124 NAWCC, Inc.