[Milsurplus] aircraft gunsights [may be O.T.]

[jedifox]

hi all,
        has anybody in this great group have any maintance information 
on the following B-17/B-24 reflector gunsights

K-4 Sperry ball turret
K-10 sperry rear cone/turret

and a gyroscopic gunsight
mark 10 model 0 with a mark 18 model 0 automatic range unit

this is just a shot in the dark ,as i've already gotten the instruction 
manual extracts on the k-4 .

thanks in advance for your assistance
highest regards
leigh


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