The foam strip is included in the package. Please do not accidently throw it out. Cut the strips to the correct slot dimensions and insert it into the grip's slots to safely secure the device. If you don't cut the strip properly and insert it onto the slots, the Ayn Thor will be loose. The instructions were engraved onto the grip itself so it should be impossible to miss... (Or so we thought).

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The trigger upgrades should fit most AYN Thor models snuggly. However its possible that various colors or batches from AYN are not dimensioned exactly so the triggers will slip off. To fix this you just need to add a piece of tape to increase friction. Note that this is a permanent solution that will solve the slippage issue, you don't need to keep changing the tape.