For the record I am not responsible if you screw up your marker doing this mod. Below I will tell you how I converted my spyder from the offset asa screw pattern to an inline screw pattern.
Things you will need:
1.No. 21 drill bit
2. 10-32 tap
4.asa with inline holes
5.drill press with a vise or hand drill
6.quick steel epoxy
Take your quick steel epoxy and cut off a 1/4" piece. Knead the epoxy together as the instructions say. now plug up the offset holes with the epoxy,trim off any excessive epoxy with a knife or razor blade so we are keeping the surface nice and level. Allow the epoxy to dry, it drys in a matter of minutes but I let mine sit over night just to be sure.
Now that the epoxy is cured put ur asa on the bottom of the trigger frame making sure it is lined up straight. With the punch mark the center of the two holes of the inline asa.
Place your trigger frame in the drill press vise making sure to pad it so you don't mar things up. Chuck up the #21 drill bit and drill out the two punch marks. I drilled my frame with the board still in the frame, it would proably be a good idea to take it out so you don't get aluminum chips all over the board possibly shorting it out when you turn the marker back on.
Now that the holes are drilled we need to thread them for the 10-32 screws. make sure the tap is secure in the tap holder, apply light downward pressure as you twist the tap into the drilled hole. Make sure you are going straight or you'll mess up your threads. While turning the tap if at any time it feels like the tap is stuck try turning the tap backwards to clear out the metal shavings.
After both holes are threaded mount up your inline drop or asa. you can apply some loctite now if you want to keep the screws from backing out.
Enjoy your new inline trigger frame.