Trigger Mechanism Pocket (be sure to measure mechanism first)

• Hint: if you must make multiple passes at a given depth to cut the pocket, make first cut at a given depth up the center then cut each side to minimize flexing of the wood. Otherwise, pocket will be slightly over-sized.
• For an Alexander Mechanism Cut mechanism pocket using long 3/8" bit
• Mark 0,0 at front center of desired mechanism location
• Cut +- 0.046 in Y direction, Cut -2.355 in X direction
• Cut down 1.1" in .3 increments

Spring Relief (in Alexander Mechanism pocket)

• Change to 1/4" cutter
• Move to center Y, 1.6675 from rear of mechanism pocket
• Cut back to 0.2 at depth of 0.2
• Set zero, then raise bit and adjust stop so bit won't touch vice when bottomed
• Return to zero and cut forward .75 until through bottom of gun
• Square round corners of mechanism pocket with corner chisel

Pinning of Alexander Mechanism

• Insert mechanism
• Align with shaft so shaft releases easily when trigger is pulled
• Align second mechanism on side of gun to locate pin holes
• Use 3/16" bit with aircraft adaptor
• (leave pins sticking out a bit for alignment of line release slot)
• Drill front pin hole and insert pin
• Drill rear hole and insert pin
• Trim trigger flush with bottom of gun

Line Release Allen screw on Alexander Mech

• place gun in mill vice with top up
• Set 0,0 at right front corner of trigger mechanism
• Come back to 1.2845 in X and out 0.250 in Y
• Drill line-release pin hole using #43 drill bit (.079)
• Be sure hole is deep enough so it is below surface after edging
• Alternatives: Under-gun release (Alexander) Wrap around rear fin tab (Heinrich)

Line Release Slot (Alexander Mechanism)

• Place mechanism on side of gun with alignment pins in place
• Locate placement of line-release slot then cut with 5/32 cutter