Venetian Blind

I had always, naively, assumed that there was some technical logic in the sizes of ready-made blinds. I now believe that there is absolutely no forethought or design, whatsoever, in choosing the range of sizes for blinds.

For example...

We have a window that is 126.5cm wide and we decided that we would fit a Venetian blind. The range of Venetian blinds that we choose includes 120cm and 150cm wide blinds.

We tried the 120cm blind, it being almost right. However, with a 3(.25)cm gap at each side, it did look a bit silly. So I exchanged it for the next size up, 150cm, so that we could shorten it to exactly the right size, just as I had done quite easily for another window (just clamp, hacksaw and then file the corners).

It turns out that due to the placement of the cords, the cord catch and the twiddly thing that adjusts the blind, that the minimum width that this 150cm blind can ever (without serious modification) be adjusted to is 131cm.

I have spent almost three hours fitting this blind tonight. And it's still not finished. Further modification, requiring a tower drill or drill stand, is still needed before it will adequately fit my simple 126.5cm window.

The conclusions?
1. There is no sane logic to the sizes of ready-made Venetian blinds
2. Buy made to measure next time.