Project / mmf counterweight discrepancy?

Vinyl Asylum

Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

I just received a "heavy" counterweight for the Project 9 tonearm on my mmf-7 and something doesn't seem right. I bought it to replace the the stock counterweight, which has to be at the far end of the tonearm shaft with a 6.8g cartridge. The box lists the "heavy" counterweight mass as 80g but it weighs just about the same as the stock counterweight (using a simple balance beam) even though it's about 10mm longer than the stock counterweight. Obviously the metal used in the "heavy" counterweight has a much lower density. So, I have to set this "heavy" counterweight at the limits of travel on the tonearm shaft just like the stock counterweight. It's NOT a heavyweight counterweight.
Does anyone know what's going on here? The Project technical sheet lists the stock counterweight on the basic 9 arm as appropriate for 6-10g cartridges and the optional "heavy" counterweight as appropriate for 8-12g cartridges. Neither one of these counterweights works right with a 6.8g cartridge so what gives? Any ideas?
It aint' heavy, it's my bother.
Tom

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Topic - Project / mmf counterweight discrepancy? - tketcham 21:29:25 04/23/07 (8)

It may not be what you think it is - newanvil 14:16:41 04/24/07 (1)

That's exactly what I think happened... - tketcham 17:43:13 04/24/07 (0)

A couple years ago I toyed with the idea - tpao 10:25:35 04/24/07 (1)

Good points... - tketcham 17:37:56 04/24/07 (0)

Re: Project / mmf counterweight discrepancy? - Vinylized 09:13:26 04/24/07 (1)

I think the problem is... - tketcham 17:45:20 04/24/07 (0)

Re: Project / mmf counterweight discrepancy? - Mark W. 22:32:16 04/23/07 (1)

Maybe? - tketcham 07:13:01 04/24/07 (0)

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