I got the #3 and #4,the three gave me about 3 1/2 lbs so I put the #4 in and now have 2 1/2 lb.If you go step by step with the instructions you should have no problem,with the springs he sends a little pin to use,the first one I ordered didn't have it,it makes it a lot easier to change the spring,the first time I let the spring get away from me and didn't find it in the carperet untill the next day,so work in a place that it will be easy to find when you change the spring.

http://www.hunting-pictures.com/memb...ght&encore.jpg