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BesTest Indicator Repair Guide
Do-it-yourself
some hints on how to repair your Bestest indicator

The following are excerpts from our newly published Repair Manual for Bestest indicators. The published version includes dozens of photographs, complete parts lists, a listing of tools that are an absolute "must", cleaning instructions, illustrated parts with cross references to TESA part numbers and many additional hints on making a successful repair.

 

BestestRepairManualcover2
Repair Manual for Swiss-made BesTest and TesaTast Indicators
by René Urs Meyer.
Complete and fully illustrated.

Contains detailed photographs of every step required to disassemble, clean, and reassemble these indicators. Step-by-step instructions on replacing and repairing damaged parts. Illustrated parts lists, parts breakdowns, exploded view drawings. Calibration trouble shooting. Repair tools and techniques. Based on over 35 years of personal experience.

click to read reviews, check price and stock

 

 

 

Table of Contents

  • Specifications
  • Can it be fixed?
  • Repair Tools
  • Disassembly
  • Cleaning
  • Reassembly
  • Calibration
  • BesTest contact points
  • TesaTast contact points
  • BesTest dials
  • Horizontal test indicator spare parts list
  • Vertical test indicator spare parts list
  • Illustrated spare parts with detailed photographs of all parts

Disassembly

BesTest disassembled parts

Paying careful attention during disassembly will make it easier to reassemble when you are done. A great many photos are included in the book to help you keep track of what’s going on. If necessary, make sketches or take your own photos along the way, and use the parts breakdown as a guide in identification.

Suctioncup

Remove the clear plastic crystal. There is no simple or easy way to do this. Suction cups have been used—like those suction darts we played with as kids— but most of the time they do not work. The quickest way is to destroy the old crystal. Any repair looks best when you install a new crystal in the process. 
Use a small (0.5 mm blade) jeweler’s screw driver with a clean, sharp blade and “drill” a hole through the plastic somewhere near the edge. Be sure to ease up just as you break through so that the blade does not scratch the dial face underneath. The crystal now comes out easily using the same screw driver.

removehand

Here is a tricky part: You will have to remove the hand. There are fancy gadgets designed for this purpose but the simple two piece hand lifters used by watch repair shops do the best job and are more versatile. They can be costly to buy but you will need them. Put them on the opposite sides of the center pinion’s shaft, under the hand, and use them as levers to push up. A slight jerk usually works best. Keep an eye on the hand so that you do not accidentally send it into orbit.

removespacer

Remove the black or white plastic spacing ring. If it seems stuck, use a sharp blade to wedge it free from the dial face. The hand lifters come in handy for this purpose.

(in the book there is an additional photo here)

Remove the dial. Sometimes it falls out voluntarily but don’t count on it. If there is oil under the dial, this will act like an adhesive and you will have to coax the dial out. A small, sharp pin, or the tweezers, can be inserted in the center hole. Careful that you do not apply pressure on the center pinion and bend it. 
If the bezel has a dent in it, then the dial will not come out until you remove the dent. Use blunt jeweler’s pliers to remove the dent for the time being. This will be corrected during reassembly.

(in the book there is an additional photo here)

You have exposed the hair spring and the mounting plate. Remove the two black screws with an appropriately sized screw driver. Do not use a screw driver that is too large or too small for the slot because it is likely to slip and the result is a damaged hair spring. A damaged hair spring is a very common reason for a repair. Here the hair spring has completely coiled up and will no longer function. Sometimes the spring has become tangled and—with care and pointy tweezers—you can untangle it. Do this after the mounting plate has been removed (see next step).

(in the book there is an additional photo here)

The entire mounting plate lifts off, revealing the wavy, circular bezel spring. The black bezel can now be removed. Unfortunately you have to go through this entire process even if all you need to do is replace the bezel.

(plus 90 more pages of detailed instructions and photos)

 

from our bookshelf

The Companion Reference Book on Dial and Test Indicators … page 178
BesTest and TesaTast Indicator Repair Manual … page 177
Starrett 711 Last Word Indicator Repair Manual … page 199
Interapid Indicator Repair Manual … page 208
Compac Test Indicator Repair Manual … page 194
Mitutoyo Test Indicator Repair Manual … page 102
 

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Long Island Indicator Service Inc
14 Sarah Drive — Hauppauge NY 11788 — USA


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This page's most recent revision: 4 MAY 2017
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Original photographs and content copyright 2017 by JWGrum

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