Reddit reviews Fotasy 70cm Mechanical Cable Shutter Release with Bulb-Lock for Fujifilm X10 X20 X30 X100s X100t X-Pro1 X-Pro2 X-E1 X-E2, Leica M6 M7 M8 and Nikon Df F4 FM2 F3 FE FM3a F80, Threaded Release Cable
We found 2 Reddit comments about Fotasy 70cm Mechanical Cable Shutter Release with Bulb-Lock for Fujifilm X10 X20 X30 X100s X100t X-Pro1 X-Pro2 X-E1 X-E2, Leica M6 M7 M8 and Nikon Df F4 FM2 F3 FE FM3a F80, Threaded Release Cable. Here are the top ones, ranked by their Reddit score.
This is a top quality manual locking cable release works with film digital or professional video camcordersA cable release is used to eliminate camera shake for critical situation where the camera must remain perfectly stillThe tapered threaded end screws directly into your cameras shutter buttonCable release is made of stainless wire and covered with a vinyl tube for durabilityLength 70cm
I had to go old school with the X-T2 :
https://www.amazon.com/dp/B0031CGW7E/ref=cm_sw_r_cp_api_pLctybXHYDPG0
see that threaded hole in the shutter button on your AE-1P ? you screw your cable release into that, and then push the button (plunger) on the other end.
It looks like this
Nicer ones have a little thumbscrew so you can hold the shutter open in 'B' mode.