Extra parts for Filament extruder puller by wingmaster

I have found different springs (from Würth https://eshop.wuerth.de/is-bin/INTERSHOP.enfinity/WFS/1401-B1-Site/en_US/-/EUR/ViewCatalog-Browse?CatalogCategoryRef=14013510010101%40WuerthGroup-Wuerth-1401&CatalogCategoryID=WEgKD92eIw0AAAFDk3Jcaz5u)
and
a larger motor http://www.ebay.com/itm/181261022748?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

So I have made some adapters and a small gear with a larger centre hole.
I have made the hole for the screw in the drum of that gear