Alvin Parallel Straightedge 2201 - Manual (Page 3)

ADJUSTMENTS
To Adjust Parallel Position:
1. Be sure all three brake knobs are free and loose. (See Figure 5 on previous page for brake locations.)
2. Grasp one end of straightedge and hold firmly against drawing board.
3. Gently pivot other end of straightedge up or down until desired parallel position is reached.
4. Secure wire under thumbscrew brake in upper right corner to maintain parallel.
To Lock Straightedge In Place:
1. With straightedge in desired position, gently tighten both left and right thumbscrew brakes.
Caution: Do not overtighten. Overtightening brake screws will damage wires.
Diagram 1
Diagram 2
Brake Screw
REWIRING INSTRUCTIONS
If your wire ever breaks or needs to be replaced,
follow these steps:
1. Release left and right end caps by removing
screws from below. Be sure not to remove screws
that keep top and bottom layers of blade together.
2. Remove all old wires.
3. Fold new replacement wire in half and thread
folded end through center of blade. Pull through
until wire is equal length on each side of the blade.
Cut wire at fold. There are now two independent wires
running through blade.
4. Grasp either wire on left side, pass around blade pulley
and brake screw as shown in wiring Diagram 2
and pass it around pulley in upper left corner of board.
Connect to spring at top.
5. Grasp the wire on right side not connected to spring
from left side. Trial and error method will be required
here. Pass this wire around blade pulley and brake
screw, then pass it around pulley in upper right corner
of board. Connect to spring at top.
6. Pass lower left and lower right wires around blade
pulleys and brake screws as shown in wiring
Diagram 2.
7. To confirm wires have been strung correctly,
hold straightedge in place with one hand and pull
gently on lower left wire with other hand. The spring
at top should move to the right. Repeat by pulling the
lower right wire and the spring should move to the left.
8. Replace end caps and secure with screws from
below. Be sure that wires remain properly threaded
around pulleys and brake screws and pass properly
through exit slots in end caps. Do not over tighten or
strip screws.
9. Follow steps 8 through 13 on previous page to finish installation.