Thorens TD 165 Speed & Belt Setup Questions


A number of years ago I bought fa TD165 for my daughter from a friend who restored it, adding better cables, a Jelco arm and Audiopoints. Now she has a new table and I'm readying the Thorens for sale. 

I tested speed with my KAB strobe. 45 looks great, but at 33 it's running a bit fast. A google search found a couple of comments suggesting there's a threaded post that can be used to dial in speed. Others replied that it was for pulley tension and not really a speed adjustment, even though it does have a bit of impact on speed. 

So my questions are:
1) If the belt is worn and needs replacement wouldn't both speeds be off? 
2) There's a tiny bit of black gunk on the lower area of the motor pulley, probably rubber residue from the belt usually being set to 33. Would cleaning the post with alcohol, etc. remove the gunk and perhaps result in a slightly slower speed at 33? 
3) Would you recommend adjusting that rod setting to attempt to slow down the 33 speed? Does adjusting the rod setting while playing at each speed adjust the speed independently or would it affect both 33 & 45?

It's a really nice vintage table! I want to get it tip-top before it finds a new home. Cheers,
Spencer
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Wow, @oldhvymec, that's some good sh*t! thanks. 

Do you happen to know a good source for a dustcover? This table has the "Frankenstein bolts" on the sides for the cover with the spirally cutouts. I was surprised to see them well north of $100 on ebay and pondering whether it would be better to add one before sale or leave that to a buyer to decide. Cheers,
Spencer
An update:
I cleaned the pulley with alcohol and it was no big deal; cleaned right up. I then tested speed with the KAB strobe both with and without a record under the KAB template. I downloaded an app that measures rpm speed and tried that too. All results were the same. 45 is accurate, while 33 1/3 comes in at 33.6...pretty darn fast! 
Next stop will be ordering a new belt. 

Thanks for the help! Cheers,
Spencer
Ebay is the best source for dust covers.

33.6? Stop fussing, that's perfect for playback..

Enjoy

I have a modified TD 145 MK 1 and I've never had a motor issue. I'm currently using an Origin Live belt to good results. Anyway, the Thoren's motors are around $200.00 however you're probably fine unless the tempo just sounds wrong.