Tech Info >> Core Exchanges & Core Conversions >> Pitfalls > Pitfalls: Avoiding Problems During the Core Exchange Process Problems happen. Fortunately, we've made a page dedicated to helping eliminate or at the very least, lessen the rate at which they occur. Consider this a basic briefing where we will describe and illustrate the common problems and how you can better prepare yourself so that these problems do not occur. Broken Tab(s): Not handled properly. Insufficient or inadequate packing. Not shipped properly. Scratched Lensing: Not handled properly. Insufficient or inadequate packing. Not shipped properly. Cracked Lensing: Not handled properly. Insufficient or inadequate packing. Not shipped properly. Yellowed Lensing: Due to extreme weathering and/or neglect. Damaged Clearcoat: Due to extreme weathering and/or neglect. Crazing Lensing: Due to extreme weathering and/or neglect. Improper cleaning due to harsh chemicals, solvents or cleaners. Severe Damage: Broken or cracked internals due to severe impact, shock or jarring. Aftermarket Components: As stated in this article, we do not like cheap/inferior aftermarket products, and for obvious reasons. Please do not try to palm your aftermarket cores off to us in exchange for our OEM cores. Surely, your deposit is more valuable.