I recently bought some pleated cellular blinds for our Velux windows from Ikea. The metal top rail is fixed to the window frame via brackets but the blind is designed to hang vertically as opposed to the pitch of a roof. I have trimmed the fabric and rails so that the blinds sit neatly inside the frames of the hinged window openers but need a secure way to fix the bottom rail at various heights thereby varying the amount of light allowed through the window. Luckily the wooden window frames taper inwards slightly which means that if I simply push the bottom rail back towards the glass it will hold itself in position. However this does create indentations in the wood so I'd prefer to come up with an alternative means to keep the blinds closed and in the right position.
There are no external cords and the blinds rise/fall simply by raising/lowering the bottom rail but are weighted so they do stay in position at any height when allowed to hang. All I need, therefore, is a simple means by which I can locate the bottom rail in various positions up/down the sides of the window frame. Some sort of sprung or friction based mechanism at either end of the bottom rail would work but it would need to be simple and unobtrusive.
Any thoughts gratefully received.
TIA
