For more help, see
http://runescape.wiki/w/User:Gaz_Lloyd/Disassembly1) First off, make a note of what item you're disassembling and how many, for example 1000 Yew shieldbow (u).
2) Make a note of your current total of all the relevant materials. You can use the analyse spell to check which materials those are. Include special components and junk.
3) Note your junk chance reduction researched so far - open your invention skill advance guide, change to 'everything', scroll down and find the last item named "research: junk chance reduction" that also says "researched". You'll need this for one of the questions.
4) Disassemble all the items.
4a) if you are using the invention master cape, make sure to keep it on for the entire process
4b) please do not use BANK standers
5) Calculate how many more of each material you have, by taking the previously noted amount away from the new amount you have.
6) Submit the data using this form!