Preparing your paint can for first use

Have you oiled your gun lately? If not, open the tip and put one or two drops of air tool oil (NOT motor oil!) on the drive pin. If you HAVE oiled your gun properly, you may need to disassemble the tip and clean the "varnish" residue (the glue that's used to hold strips of nails together) from the pin and its channel. Use paint thinner, or scrape the metal parts clean with a fingernail or a piece of hard plastic. DO NOT use a metal scraper, as you may damage the gun and create much worse problems.

Yes it can, but you are going to need special equipment. Such as a vacuum pump to remove the air, Touch to repair the hole or replace the evaporator that you poked the hole in. Along with a set of gauges and refrigerant.
This is not a job for the average DIY'er and even as a pro I only repair sealed systems (leaks, compressor, etc..) if they are under warranty because it's a time consuming and costly job other wise.
If the refrigerator has any age on it then you may want to start shopping around for a new one.

This is for assembling the Breville Wok lid. This has a built in vent that lets steam escape during cooking. There are 8 pieces not including the glass cover: bolt, metal vent, black O ring, tan round plastic piece, black lid piece (has open/close) on it, spring, clear plastic seal, lid handle.
Order of assembly as follows, starting on inside of glass cover.1. Bolt.2. Metal vent piece sits on top of bolt.3. Black O ring fits snuggly onto of vent piece.Insert what you have assembled against inside of glass cover, bolt poking through topside of glass.4. Add tan plastic piece with 3 prongs going facedown against the glass hole of cover.5. Larger black lid piece goes next. You will need to line up the openings on tan piece and this lid piece so that it sits semi-flush against glass. When complete this piece will turn in place to open/close vent (less than 1/4 turn before stopping).6. Add clear plastic seal to underside of handle.7. Place spring between handle and top of black lid piece and screw together until snug.
Test lid by turning lid piece. It should move back and forth according to the open/close print on top. If no luck, go to step 5 and try again. It is a little tricky, but does work when done correctly.

lid seal if not making. no cure