I don't have a TD125, so cant help you with the board dimensions, but here are the specs for the RB300, which should provide all the info you need.
Good Luck
RB300 - Technical Specification
Low effective mass 11 grams
Effective length : 240 mm
Overhang : 17.2 mm
Offset angle: 23 degrees
Mounting distance: platter centre to arm hole centre : 223 mm
Diameter of mounting hole : 24 - 25mm
Size of base mounting nut is 32mm A/F (across flats)
Maximum armboard thickness: 27mm
The arm overhang to the rear - 50mm to the end of the counterweight stub
Total Weight 436 grams
The tip of the stylus should be 240mm from the pivot. In approximate terms, the armboard mounting hole should be such that the cartridge stylus will "overhang" the record centre (spindle) by a distance of around 17mm for an arm that is of 240mm Effective Length (distance from stylus to armboard mounting hole centre). Roughly check this by swinging the stylus over the record spindle.
Good Luck
RB300 - Technical Specification
Low effective mass 11 grams
Effective length : 240 mm
Overhang : 17.2 mm
Offset angle: 23 degrees
Mounting distance: platter centre to arm hole centre : 223 mm
Diameter of mounting hole : 24 - 25mm
Size of base mounting nut is 32mm A/F (across flats)
Maximum armboard thickness: 27mm
The arm overhang to the rear - 50mm to the end of the counterweight stub
Total Weight 436 grams
The tip of the stylus should be 240mm from the pivot. In approximate terms, the armboard mounting hole should be such that the cartridge stylus will "overhang" the record centre (spindle) by a distance of around 17mm for an arm that is of 240mm Effective Length (distance from stylus to armboard mounting hole centre). Roughly check this by swinging the stylus over the record spindle.
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