In the world of industrial machinery, a few thousandths of an inch can mean the difference between a rotor spinning true for a decade or a catastrophic bearing seizure within a month.
For passive metals (stainless steel, zinc, anodized aluminum) or large gaps (>0.3mm), use an activator like Loctite 7471 or 7649. This speeds up cure time from 24 hours to 30 minutes. lokfix p80
Use a solvent cleaner (acetone or Loctite 7063). Remove all oil, grease, and old threadlocker. The surface must be "water-break free" (where water forms a sheet, not droplets). In the world of industrial machinery, a few
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Slide the parts together with a twisting motion to spread the adhesive evenly. Do not "pump" the parts in and out—this introduces air bubbles. Use a solvent cleaner (acetone or Loctite 7063)
Apply 360 degrees around the inner surface (for housings) or outer surface (for shafts). For vertical shafts, apply to the leading edge of the pin so it spreads during insertion.