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 # Push-buttons
 Current PortaPack models have five push buttons on the front (UP, DOWN, LEFT, RIGHT, and SELECT) and two on the top (DFU and RESET).  In most cases, a long press of a directional button will repeat automatically after a short delay (firmware may define additional behavior for a long press of any button).
 
+If the push buttons "stick", check to make sure that the buttons are centered in the holes in the case, and are not rubbing against the inside of the holes.
+
 If the push-buttons are intermittently unresponsive, first make sure that the Portapack firmware is upgraded to version 1.7.1. or later, which improves handling of glitchy switch contacts.  The type of push-buttons used on the Portapack is SMD tactile switches of 6 mm per side and 7 mm of height. You can buy replacements here: https://a.aliexpress.com/_dZqx4vv 
 
 The easiest way to remove them is to clip the legs off, clean the pads carefully with solder wick and solder the new buttons.