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if I let go then reapply pressure to the holding points on the wheel.

I hold the three arms to the wheel as I adjust. I think that is how you are supposed to use it.

during shipment the machine was damaged so the the motor is misaligned

Just what I was about to suggest. Definitely not right!!!

Agree completely with the previous answers. Just a couple of additional thoughts. Tormek say that the SG when fine graded gives you 1,000 grit. If you want to then you could then hand sharpen on the 3,000 stone then strop as you normally do since you would not be changing the bevel. What I do on high end knives is to strop on the Tormek wheel then hand strop with a quality green compound. On my nice chisels and plane irons is to do a few strokes on my 5000 grit ceramic stone and then hand strop. It is maybe 30 sec extra but seems to give me a slightly better edge. I also often refresh the edge on my woodworking tools on the 5000/hand strop which keeps it fresh and go back to the Tormek for major sharpenings. 

I'm looking for some cheap tools to practice on

If you do a search on AliExpress for "wood turning tools" then you will see quite a selection for some very reasonable prices. Make sure yu select the appropriate tools for the type of turning you want to do.

Yes, it does sound like something is scraping. The shaft may be slightly bent. Check the body and wheel to see if you can see any wear marks where it could be scraping. Not sure that it will really do any damage but do check with Tormek.

This could work - https://forum.tormek.com/index.php?topic=5335.0

Hmmm, not sure that it is vitrified but I cannot see that it would damage the bond in any case.

A few thoughts.

Is the wheel on the machine the SG or the SJ? It is not clear from the photos. If it is the SJ then you will take forever to get a bevel. If it is the SG then do you have the grading stone to change the grit? You reshape the bevel with the coarse grade then finish with the fine grit and then if desired the SJ wheel.

If you ware having trouble holding the jig down then toy are using too much pressure on the knife. Let the wheel do the work. If so then it may be you are not regrading the SG to the coarse setting, see prev para.

My old T7 was a bit noisy, did not worry me too much. Also if the honing wheel has a bump then it is perfectly fine. The leather is not always perfectly smooth. That will not impact the honing.

Did you clean and grease the shaft? The recommended is white lithium. It is water resistant and really sticky. Remove the shaft, clean it with a rag and re-grease the bearings. It pays to repeat this every few months, especially if you are using it a lot.

As for the heat it can get quite hot without doing any damage but if the shaft is not properly lubricated and/or you are using too much pressure then it can put excessive load on the motor.

My first guess would be to use white lithium grease

This is what I would use. Very sticky and would not need reapplying all the time as much as a lighter product.

Hugo, Yes, I liked it very much. Just a thought, it may also be worth while scripting these videos. I know the "live style" videos are very attractive but scripting may make them more focused and the English more polished.

Tormek Innovation have just posted a new video on knife sharpening covering the T1, T2, and T8 using the KS-123.

https://youtu.be/b3xkBU2GjcE?si=GWBPOdFqzccr6gHC

It sounds to me like the old irons have lost their temper. If the steel is too soft then the burr will be difficult to remove.

Once you set the bar height for the first one make a note of the protrusion and set them all with the same protrusion.

It has a 1/2" arbor bore, so it would need a bushing to fit the Tormek 12mm shaft.  That is a difference of 0.472" vs 0.500", or 0.028" total and 0.014" wall thickness tube.  Good luck finding that.

That is 0.7mm or 0.35mm wall thickness.  Just get a 0.35mm shim of plastic.

Tormek do offer a 5,000 grit wheel, The SJ series. You can also get higher grit wheels from third parties to fit the Tormek.

I will hand hone on a ceramic bench stone if I want a finer edge. Usually on my quality bench chisels, Japanese knives, or Plane blades for finishing work such as my smoothing planes.