Originally Posted by
Drew Wiley
Things can be somewhat temperature dependent due to metal expansion/contraction issues; so don't over-tighten. You'll need miniature slotted screwdrivers as well as very small metric Allen wrenches for general fine-tuning of standards, but just miniature slotted-blade for focus tension itself. You want to carefully balance all three screws so the travel is perfectly linear rather than skewed without any bias toward one side or the other. My field kit contains 2.0 and 2.5 mm hex wrenches. The focus tightness screwdriver is .30 mm thick at the tip and should not be more than 2mm wide. You will need something larger to tighten the big clamping elements around the rail, like an electrician's screwdriver, but first you need to loosen the tiny Allen screws at the ends of the rail blocks. The fine focus gear mechanism has no secondary locking screws, so is more straightforward.
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