For those unfamiliar with this, the cord that raises and lowers the blinds applies friction against a wheel in a slot (when pulled to the left). When the wheel

For those unfamiliar with this, the cord that raises and lowers the blinds applies friction against a wheel in a slot (when pulled to the left). When the wheel is shifted it holds the cord in place and the blinds and they stay in position. Pulling to the right releases the wheel and the blinds move freely. Incidentally, one of the cords on the blinds in my office is worn, and it dis a poor job of engaging. So one side will latch the others will not.