I was stretching shutter curtains with my fingers for months and a guy in Phoenix set me straight
Watched a repair guy on YouTube use a wooden toothpick to set tension and realized my finger method was adding uneven pressure and killing my 1/500 speeds. What small tool swap changed how you handle curtains?
Bamboo skewer worked for me after I saw a similar tip. The flat side gives you way more feel than your fingertip ever will, and you can actually hear the curtain tension change as you turn it. Mine kept drifting on the second curtain because my thumb pressure was all over the place, and the skewer fixed that in one afternoon. Just go slow and check your speeds after each small turn, because it's easy to overshoot and wreck a good setting. What speeds were you losing before the toothpick trick?