Ketchup,
I have played with titanium components on the ET2 some years ago. I overhauled a company that manufactured custom wheelchairs, including custom titanium frames, with custom brackets to meet individuals needs. Unfortunately titanium is very brittle to machine, it shatters very easily and I think you will find it difficult. As an aside titanium tube is not rigid, you can actually bend it by hand, but it does have fantastic damping qualities. I have a titanium arm tube sitting around somewhere, but have not used it.
With regard to the aluminium one piece gooseneck, mine is the same as Krebs, and I use it in an ET2 & aluminium arm tube with both MC ( Carnegie, Koetsu, Denon 103 ) & MM ( Shure V15Vxmr with brush removed ). I have never had stridency from my ET2.
Bear in mind my ET2 aluminium arm tube has had the foam & shrink wrap removed, the teflon insert in the headshell removed and replaced with carbon fibre. I also run a loose decoupled counterweight ( tuned with teflon bushes ) that is much lossier than the standard spring for both MM & MC. Frogman has trialled this and attained the same benefits of quicker and more transparent bottom end ( literally more notes in his system ).
So my suggestion to Chris if he wants to run an MM in the ET2.5 with the aluminium gooseneck would be to try loosening off the counterweight nut and lower the overall horizontal mass ( above FR ). If you back the nut off and then dial it in slowly whilst listening to the changes you can tune the counterweight motion quite precisely, even more so if you put a tiny wedge either side of the spring to control the motion ( I used teflon ).
I have played with titanium components on the ET2 some years ago. I overhauled a company that manufactured custom wheelchairs, including custom titanium frames, with custom brackets to meet individuals needs. Unfortunately titanium is very brittle to machine, it shatters very easily and I think you will find it difficult. As an aside titanium tube is not rigid, you can actually bend it by hand, but it does have fantastic damping qualities. I have a titanium arm tube sitting around somewhere, but have not used it.
With regard to the aluminium one piece gooseneck, mine is the same as Krebs, and I use it in an ET2 & aluminium arm tube with both MC ( Carnegie, Koetsu, Denon 103 ) & MM ( Shure V15Vxmr with brush removed ). I have never had stridency from my ET2.
Bear in mind my ET2 aluminium arm tube has had the foam & shrink wrap removed, the teflon insert in the headshell removed and replaced with carbon fibre. I also run a loose decoupled counterweight ( tuned with teflon bushes ) that is much lossier than the standard spring for both MM & MC. Frogman has trialled this and attained the same benefits of quicker and more transparent bottom end ( literally more notes in his system ).
So my suggestion to Chris if he wants to run an MM in the ET2.5 with the aluminium gooseneck would be to try loosening off the counterweight nut and lower the overall horizontal mass ( above FR ). If you back the nut off and then dial it in slowly whilst listening to the changes you can tune the counterweight motion quite precisely, even more so if you put a tiny wedge either side of the spring to control the motion ( I used teflon ).