09-10-2021, 11:33 AM
Hi
I have never been quite sure why brass discs are needed, unless it is to keep damp wooden discs away from contact with the steel parts to avoid rust buildup.
I converted some time back to a twin front setup, and found a small but worthwhile improvement in stability. One would expect an increase in roll damping for the twin setup, as the single arrangement suffers from reduced damping when the arms are travelling in opposite directions.
The only downside is that the modern adjusting nuts have standard threads rather than the fine pitch of the original, which makes setting the correct tension more difficult. I use a spring balance and aim for about 18 lb at the end of the arm before it begins to move.
I have never been quite sure why brass discs are needed, unless it is to keep damp wooden discs away from contact with the steel parts to avoid rust buildup.
I converted some time back to a twin front setup, and found a small but worthwhile improvement in stability. One would expect an increase in roll damping for the twin setup, as the single arrangement suffers from reduced damping when the arms are travelling in opposite directions.
The only downside is that the modern adjusting nuts have standard threads rather than the fine pitch of the original, which makes setting the correct tension more difficult. I use a spring balance and aim for about 18 lb at the end of the arm before it begins to move.