I've got some over at NerfHQ of the internals. I think the spring you are missing is the one that goes on the orange sight. If you lost it you can just take one out of a machanical pencil.
The only Ratchetblast internal pics I know of are Yakman's.
The picture is in this gallery(You'll have to wait however for NerfHQ to come back online.) NerfHQ Gallery