Above: No. 3 right-angle attachment for the Model J Head. This heavy-duty 4 to 3 reduction unit was very well made with hardened and lapped spiral-bevel gears and the hollow spindle, designed to accept standard R-8 tooling,  running in pre-loaded ball bearings. The attachment is shown in combination with the Auxiliary Arbor Support, a device that greatly improved its performance when used for horizontal milling. The collet capacity range was 1/8" to 3/4".

Left: the No. 4 Right-angle Attachment for the Model J Head. This was a lighter-duty, 2 to 1 reduction unit that took an N-2 collet in its spindle with a capacity range of 1/16" to 1/4".

Above: dimensions of the No.  4 Right-angle Attachment for the Model J Head.
No. 4
A = 4.25"
B = 7.28125"
C = 0.84375"
D = 1.96875"
E = 2.1875"
Collet = N-2
Collet Capacity = 1/16" - 1/4"
Speed reduction 2 : 1

Above: dimensions of the No. 3 Right-angle Attachment for the Model J Head.
No. 3
A = 4.25"
B = 6.625"
C = 1.5625"
D = 4.8125"
E = 2.375"
Collet = R-8
Collet Capacity = 1/8" - 3/4"
Speed reduction 4 : 3

No. 1 Heavy-duty Right-angle Attachment for the Model M Head. The 2 to 1 reduction spindle accepted a B-2 collet with a capacity range of 1/16" to 1/2".

No. 2 Right-angle Attachment for the Model M Head. The Spindle, with a speed reduction of 2 to 1, accepted a N-2 collet with a capacity range of 1/16" to 1/4".

Above: dimensions of the No. 1 Right-angle Attachment for the Model M Head.
No. 1
A = 3.375"
B = 5.0625"
C = 1.28125"
D = 3.375"
E = 1.875"
Collet = B-2
Collet Capacity = 1/16" - 1/2"
Speed reduction 2 : 1
Min. working space: 4"

Above: dimensions of the No. 2 Right-angle Attachment for the Model M Head.
No. 2
A = 3.375"
B = 6.5"
C = 0.84375"
D = 1.8125"
E = 3.1875"
Collet = N-2
Collet Capacity = 1/16" - 1/4"
Speed reduction 2 : 1
Min. working space: 2.625"