Tips for installation:
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At the bottom bracket solve both letter. Trimmer unclip and also remove the two screws of the spring holder.
Remove spring.
That was easy. Now for some tricky part. The Einstellread must be deducted. This is "held nose" from two sides with a. Where there where the numbers are applied a spring pressure element is, on the opposite side but is a firm "driver nose that drives the mechanism up and down.
Make adjustment to the smallest value. (Best of a penknife) go on the opposite side, with a flat blade screwdriver carefully under the ring, lift slightly and remove the ring upwards. Use little power is OK.
The battery can be removed easily. On the positive poles of the replacement batteries put on the two enclosed white rings and the batteries in the designated Hallerung einrasteh sick leave.
Please check prior sen assembly if the batteries work (for me they were ready to load). Everything in the reverse order to build ogether again. Done.
Conclusion:
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Price / performance: Good (devaluation wg the high price.)