The original Lenco arm has an effective length of about 229 mm, so if you want to do a minimum amount of cutting you need to look for arms of the same length. This includes the Audioquest, Hadcock, Linn, Mayware and Mission arms. The Rega arm has an effective length of about 237-240 mm, so will either need a hole cut in the top plate, the corner of the top plate cut off, or the top plate rotated.
Of course, the other concern is the fact that the platter is partially sunken into the top plate, so that even if the arm fits in the original hole, it will tend to be sitting with the rear end up, so to speak. That is the other reason for cutting off the corner or rotating the top plate.
Of course, the other concern is the fact that the platter is partially sunken into the top plate, so that even if the arm fits in the original hole, it will tend to be sitting with the rear end up, so to speak. That is the other reason for cutting off the corner or rotating the top plate.