Residual magnetism in the right flipper coil stop
Mushroomed plunger in the flipper
dirty nylon sleeve in right coil
worn extension spring

(In general, worn parts cause this)

Sounds like you need to rebuild your flippers. Right flipper on no fear gets a lot more use than the left so wears faster.

Dirt, worn parts, or someone greased some parts that should never be greased. Any one or all of those things could cause your problem.

Did your rebuild include a new nylon sleeve in the coil? If so, did the old one come out and new one go in easily? If not, then you have a swollen coil that needs to be replaced.

Make sure you have a slight up-down play on both flippers both at rest and at the end of their travel - makes a huge difference in resistance of the flipper.

For some reason when the flipper pulls in, the spacing is different, probably because of the ability of all the parts to twist slightly.

If one of the flippers is kind of tight at the top, you just redo it with a little more up-down play at the bottom. Someone recommended cutting a credit card into a U shape to make a spacer to make it easier; I usually do it by feel now. It's a pretty common issue when you start to rebuild flippers to think you have enough play based on the at rest position, but then you run into something like you're seeing where the flippers don't return at the same speed, or worse, they don't FLIP at the same speed, in extreme cases.

Does the flipper do the same thing if you manually move it while the machine is powered off? If yes then the issue is mechanical. If no, then the issue is electrical. I'll let more experienced techs chime in if it is electrical... Here are pics of the gap tool that others are mentioning and how to use it. I use a rubber band to hold it on the flipper. You can make one out of an old credit card too.

9058876_orig (resized).jpg

1919440_orig (resized).jpg

And here is a great version of Kid9000's complete guide to rebuilding flippers:

http://www.performancepinball.com/rebuilding-flippers.html

No Fear should have a round clear plastic disc on the right flipper button to activate the opto which should be mounted lower than normal to avoid getting hit by the shooter plunger. Without that, the switch can get hung up which you will not see with the playfield up. I have seen that disc removed and switch moved more than once.

Yep, you can see the original screw holes under it. Same as my latest one came and my flipper was sticking too. This disc screws onto the end of the flipper button and you might want to get a new one of those too.

Hope this solves your problem. If you take the apron off, you can see what is happening with the playfield down.

https://www.marcospecialties.com/pinball-parts/03-9366.2

detail (resized).jpg

The flipper button probably got gummed up and the extra leverage from the disc caused it to stick is probably why it was removed. Now the opto interrupter is probably hitting the shooter.

DSCN6825 (resized).JPG

I only knew that because my first No Fear had the disc which at the time I had ordered an extra. My latest one it had been removed and I was having a problem similar to yours. I had to replace the button too to get it to work. Just wish I had seen this thread sooner as it looks like you have had some frustration.

I also had an extra long bushing for the jump ramp flipper but it broke and it looks like the only place to get those now is in Europe. It still works though.

I was a charter member, but lately just play it without too much to add much to the conversation. Although when I had payback time during no limits recently, I wasn't sure I wasn't getting ripped off. Can't be sure. Won't be selling this one. It's therapy.

Two games now.

DSCN7031 (resized).JPG

Rick and Morty. I did it. I admit it. lol.

Did you ever get yours fixed? Marco's out of them now, but Pinballlife has them.