Block
Size
Part
No.
A
B
C
D
E
F
G
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
75 mm 2682
9
/
32
7
2
17
/
32
64
17
/
32
13.5
27
/
64
11
2
15
/
16
75
4
1
/
16
103
1
1
/
4
31
2682 Cheek Block
Position block so ratchet turns in desired direction. Refer
to arrow for sheave direction in ratchet mode. Flip block
to change direction. Use chart below or use block as a
template. Mark holes using centerpunch. Check marks
with block before drilling. Remove block.
Important—
holes are different diameter.
Use two drill sizes for
deck holes. See chart and diagram. Bevel top of deck
holes using a small knife to allow sealant to mass.
Place gasket under block. Through-bolt block using
recommended stainless steel fasteners, washers and
lock nuts.
Ratchamatic cheek blocks include metric roundhead
screws, washers and nuts. See chart below:
Block
Part No.
Size
Drill sizes
Supplied
fastener x length
mm
in
2682
75 mm
4.25 / 5.25
11
/
64
/
13
/
64
M4 / M5 x 60 mm
*Fastener length: Add deck thickness and overhang for nut and washer.
Remove circular mounting cap. Position block so ratchet turns
in desired direction (see drawing below). Flip block to change
direction. Use chart below or use block as a template and mark
holes using center punch. Check marks with block before drilling.
Remove block and drill holes using drill shown below in chart.
Bevel top of deck holes using a small knife to allow sealant to mass.
Place gasket under block. Through-bolt block using recommended
stainless steel fasteners, washers and locknuts. Do not overtighten
center screw or ratchet will bind. Test block after mounting to make
sure ratchet engages smoothly and rotation direction is correct.
Ratchamatic
®
cheek blocks include metric roundhead screws,
washers and nuts. See chart.
2633 Cheek Block
Block
size
Part
No.
A
B
C
D
E
F
G
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
57 mm 2633
7
/
32
6
1
3
/
4
44.5
21
/
64
8.3
3
1
/
4
83
2
1
/
4
57
1
25
1
5
/
32
29
Block
part no.
Size
Drill size
Supplied mm size
fastener and length
mm
in
2633
57 mm
4.25
11
/
64
M4 x 60 mm
*Fastener length: Add deck thickness and overhang for nut and washer.
C
B
A
D
E
F G
G
B
A
F
C
D
E
Deck hole drill
5.25 mm (
13
/
64
")
Deck hole drill
4.25 mm (
11
/
64
")
3-Way U-Lock—2629 / 2630 / 2632 / 2634 / 2685 / 2686 / 2687
The 3-Way U-Lock on doubles and triples allows a change
of headpost direction from front-to-side or allows the block
to swivel. To change headpost direction, remove shackle, turn
post, install shackle. Remove U-Lock to allow block to swivel.
1
2
Adjust Cam Angle (Single/Triple)
1. Loosen cam arm locking plate screw and pull outward
to disengage.
2. Rotate cam arm to desired position.
3. Press locking plate in and tighten screw.
Do not
overtighten screws or sheave will bind.