[Healeys] OD 3/4 lockout switch

[bspidell at comcast.net (Bob Spidell)]

I need to reinstall this switch (the one mounted on the gearbox top 
cover that prevents OD engagement in 1st, 2nd and reverse). There are 
fiber washers stacked up under the switch base--apparently for proper 
alignment and clearance with the shift lever--does anyone know the 
secret for doing this correctly??? I don't have my shop manual handy.

TIA,

Bob