Merlin Major? Timing help.

[Shadow50]

Hello to all,

I am interested in getting a Merlin Major (at least I believe it is a major) back on the tracks.

It lost a set/grub screw a while back and lost its correct timing.

Would anyone have the documentation or know how to get the timing set on this loco, I have been trying but to no avail.

Any help would be appreciated.

Mark