Due to my current health situation, it would be good for me to sit higher. If I screw up the seat, the seat also moves forward in addition. Now I lack the depth to sit in the length. If the seat would increase “senkrecht” everything would be ok. I am aware that the thing is complicated. Therefore I was at the TÜV today to clarify a single acceptance. If the seat does not come higher than this can be adjusted so far for the TÜV “everything is Ok”. We measured together, seat fits in the back plus 5 cm height. I should have the conversion done in a qualified workshop and if this were made reasonable, the TÜV acceptance would actually not be a problem according to the examiner. Does someone know here a company that offers such a thing in a realistic price frame? I found only one supplier, however, who wants to have fabulous 1000 € for it. Oli