If this is the dual trigger Weller gun and your tips are held in place by either set screws or by locking nuts, Just loosen both of the parts that are holding the tip to the gun and then retighten them back up. Soldering iron tips that appear to be tight might not be and this will insure that the tip is indeed tight and also cleans up the connection of the tip to the soldering iron. Oxidation from heating and cooling will cause a tip to not get very hot. Loosen the tip holder and then retighten it. Hope this gets you going again.
Steel tip darts are mostly used with bristledartboards. Steel tip darts have a very sharp steel point to stick in the fiberof a bristle board. Soft tip darts are mostly used with electronic dart boards.Soft tip darts have a flexible, plastic tip on the end to easily lodge into theholes on electronic dartboards. I prefer the soft tip because it's usuallylighter than steel tip darts.
Writing a tip on FixYa is simple. Sign in and visit your My FixYa homepage. Visit the answer tab and click the "Write a Tip" link located on the left. This will navigate you to the Write a Tip page where you can enter your tip.