Animation trouble

[jdc527]

I have been trying to modify/fix various reloads in bf1942 and I’ve some success with the handguns and bolt actions. The one that’s stumping me is the fg42, adding a charging animation instead of the weird pump action thing…
My problem is linking and when I change one part of an animation say frames 20-30, everything before and after gets messed up like arm position and such. Does anyone have any tips for me, or something I can use to force arm positions at a start/endpoint and for movements in the middle to not get messed up? Thanks y’all.