My new dryer thumps every revolution

Check the belt that is on the drum. It sounds like it may have a chunk broken off of it and you may need to replace it.

It is safe to use the dryer, I don't see any foreseen future to other parts. But the idler definately is flat(tening). It should be replaced asap.

bearings that center drum probably bad.

The drive belt broke and the thumping was caused by a flatten roller on the belt tensioner. Replace the tensioner pulley and the belt to get it running like new again

Replace the rear drum roller supports.

Check the 4 feet & make sure top of of appliance is level. These 4 feet will have threaded adjustments, just tilt the dryer back and should be able to turn with your hand or may require pliers, good luck.

no and its your rollers...babump babump...

I'd say take the 50% off offer. Dryer drums are very thin, and a weld would most likely still make a thump noise every time it passed the drum supports. (two thumps per revolution) I've seen this on other brands which use thin stainless steel drums. (I didn't look up your model to see if the drum was SS or powder coated metal, or galvanized, or whatever) It is not a real common thing, but certainly not unheard of. I'd say it was indeed a poor weld, but the manufacturer's generally won't help much once it makes it past the warranty period. Don't bother rating this, as anything but a FixYa lowers my rating. Thanks.

probably the rear bearing or the drum shaft

Henry, its going to be 1 of 2 things. Check inside your drum, see if the vent in the rear has burning or discoloration around it. If it does, it sounds as if your vent is restricted causing the unit to overheat, so clean/fix/replace the venting and your support pulleys will need to be repalce ie flat spots from overheat. If there is no scoarching marks and you know its not the vent or heat issue, the drum seam may have parted causing the thump as every revolution is made.