Vintage DD turntables. Are we living dangerously?

Halcro,

When your Acromat arrives, you will notice that it has square edges. Looking at the inside of the base of the raised edge on the platter, you will see that there is a slight radius. Because the Acromat's diameter is a tight fit when placed in the lip of the Victor's platter,this radius to square corner bothered me so I did slightly chamfer (bevel), the underside edge of the Acromat so that I wasn't worried about interference (the square corner riding a radius). I might have been overreacting to a possible non-existent problem but had I not done something, I would have thought about this for ever. Anyway, the Acromat sands very easy so take my comments only as something to consider.
Hope you like what it brings to the party! (grin)

Regards,

Doron, You obviously know your stuff when it comes to lubricants. Thank you for the information, some of which I once knew but had forgotten. Your last remark is the focus of my question: Do you mean to say that there is some fundamental difference in the way Royal Purple (RP) motor oils are formulated as compared to Redline motor oils which would account for the reported observation that RP 5W30 sounded better than Redline 20W, other than viscosity? My point was that the difference in sonics observed the the OP might have been due entirely to the difference in viscosity between the two oils. Do you think yes, or no? It was after that when I made my ignorant remark about slow motor speed.

You must realize that if you say RP oils are superior to Redline for use in a typical TT, then at least several of us are going to run out and buy RP motor oil. I've got the Redline 20W in my Kenwood L07D. By the way, I'm not interested that much in "stop times". I don't know what it means for a tt platter. A very low viscosity lubricant (I can imagine) might allow for long stop times (at first) while also doing damage to the bearing in the process.

If any direct comparisons were to be made between the RP and Redline products and I'm not sure they were, varying viscosity's certainly would make them suspect.

Ok, I'm game. I'll buy the RP XPR 05w-20 race oil and re-run the test(s) with the same weight Redline.

Don,
I ordered the special Achromat 1200 which was designed for the lip on the Technics 1200....so I suspect the underside is already tapered to accomodate this?
Will post photos when it arrives.
I've also got a glass mat on its way from Japan.
Apparently Victor produced one for their turntables and get this.....the instructions say that the pigskin mat is designed to go UNDER the glass mat...❓👀
This would never have occurred to me...🙈
Of course I'll try it both ways....but I wonder if you've tried a suede mat UNDER your Achromat..❓
Worth a try....those Victor engineers knew their 'onions'....👅👍