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Completed. Works perfectly. | 
Looks nice, nearly invisible. | 
On the first attempt I forgot to fill the drilling hole in order to give the drill a center but fortunaltely it worked well. | 
The first drilling hole gave me the courage to try the rest. |

Yoe need a slide bushing because the dril will "dance" in the hole without it. I later used another one which was much longer. | 
The first attempt for a slide bushing. I made at least 4 different ones but they all did not work well. I must build a better one before I go to work on my 12strings.. | 
The inside 6 and outside 10 mm ball bearings fit exactly the axles of the Schaller machines. | 
It takes some courage to work with this drill on the guitar if you have to work free-hand. |

These ball bearings are surprisingly cheap and very effective. | 
I use different tunings very often and this construction did not work properly. I remembered to have an easy-tuning classic guitar with Rubner machines and they are equipped with ball bearings!! | | |
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