Agree
 

Yes, batting donuts are legal. Did I state batting donuts were illegal? This argument has no merit because I also acknowledge batting donuts are legal. BTW, LL specifically states that batting donuts are legal too.

It does not specifically mention that the traditional 1" inch donuts are legal.

I asked whether 1-3-3 includes 1" donuts which are illegal in other jurisdictions. LL rules specifically state that traditional batting donuts are illegal. The fact that FED does not mention it, does not make it legal either. Checking w/ my supervisor is easier than asking about it here.

I believe that "remains part of the bat" refers to devices used during warmup, and certainly must come off before going to the plate with bat. Normally, batters warmup by holding the handle end :) so as long as the device does not come off while swinging warmups it is legal. The "warmup bat" shown in original post is a weighted bat made for the purpose of warming up. It has a handle with a knob on it, like a regular bat, and a weight at the other end. It does not have a barrel because there is no need for one.

A doughnut that flies off the end of the bat during normal use is illegal.

I don't know, nor do I care, what donuts LL has allowed or outlawed. All donuts (assuming they don't fly off the end of the bat) are legal in FED.