Hello SunnyBoy
I took an old piece of Oak door jam. I used the old Gyrodec round armboard to make a template. I cut an odd shaped piece, no two sides parallel or of the same length. (I think this might help with diffracting any resonances better). First I drilled the holes to mount the board, mounted it, then I used the Triplanar template supplied to drill those holes. There is some play when mounting the arm, so make double sure you have exactly 233.5 mm from spindle to pivot point. Doug Deacon can give you better instructions than I.
Bill
I took an old piece of Oak door jam. I used the old Gyrodec round armboard to make a template. I cut an odd shaped piece, no two sides parallel or of the same length. (I think this might help with diffracting any resonances better). First I drilled the holes to mount the board, mounted it, then I used the Triplanar template supplied to drill those holes. There is some play when mounting the arm, so make double sure you have exactly 233.5 mm from spindle to pivot point. Doug Deacon can give you better instructions than I.
Bill