[bioengine]

What if I just stop them completely?

your arms decelerating isn't something you physically try and do in the golf swing, If you try to achieve arm deceleration physically you will hit the ball fat.

The arms slow down they don't actually come to a complete stop.

Each body segment accelerates and decelerates. This must occur for the law of conservation to work.The reason for deceleration of each segment is so speed can be transferred to the next body segment.

In order for this to work you effectively you need 6-M-1 (kinetic link) conservation of momentum and Muscular loading.
If you have all these combinations each body segment will accelerate and decelerate and pass speed to next segment.
(This happen naturally) This continues up through your kinetic Link (6-M-1). Hips,upper body,arms,until distal end speed is transferred to the club.
This all happens naturally when you have trained your body how to create conservation of momentum and muscular loading.

These events you can apply physically by going to the practice fairway grinding balls.

Regarding the SSC this is complicated topic to speak about and for people to understand SSC and muscular loading I would need to write a 50 page essay.There's mountains of information you need to learn, to develop an understanding how this works in the golf swing.

Weetbix.
What do you mean by this below????
Absolutely. Sooner the better. Somewhere around you right ear would work best for you I suspect

Not sure what you mean here ???