Soooo ... now the local RC shop finally got some silicone oil back in stock. I bought the 500,000 cst one, which cost me €5. I timed the descent, and if do a small trick of positioning the lever so that when I let it go it slowly tips and starts dropping down on its own, the descent takes just under 9 seconds. If I just push the lever all the way down the descent takes just over 5 seconds. My previous tonearm was a bit easier: Just push the lever all the way down and walk away, and it would very slowly drop down. No tricks needed. If these 9 seconds are not slow enough for me in the future, I will go back to the shop and buy either 1 million cst or 2 million cst, because they had that too. As for why I used grease and not silicone oil to begin with, I had read a bit on various forums, and while I might misremember this, then I was under the impression that using grease was either preferable to or at least as good as using silicone oil, and that using lithium grease was just as fine as silicone oil as long as it had the same viscosity. Although I was obviously mistaken about this, I actually thought grease might have been thicker than the silicone oil, and therefore using the lithium grease I bought would have made for a slower descent. I found the conversion from cst to the grease thickness scale difficult to figure out, but I was under the impression that the grease thickness I had found corresponded to something like 200,000 to 300,000 cst. In any case, I think the issue is fixed now, and if not I can buy the 1 or 2 million cst in the local shop. So, I thank you all for your help. Obviously, using the silicone oil was the right move, and I'm still a bit shocked that buying that tool for the metal cap made such a difference.