You will find the whole process in the workshop sticky or the Wiki under building scales...

I really advise for just tightening using a 4oz or less Ballpeen hammer
if you decide that the $5 you can buy them for on Amazon is frivolous or if yer in a hurry the back of a Tablespoon and many light taps will fix it too...

Just remember Tap tap tapitty tap, NOT Bang bang bang