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Help with fitting an incabloc shock spring 975.03 to a FHF 69-21 dial side


Hi, I need some advice please on fitting an incabloc shock spring 975.03 to the dial side shock bloc. Can I just push the spring in horizontally to secure it in the hing or do I have to punch the bloc out install it from the outside then press it back in again?

was hoping to do it the easy method but i have tried and it does seem to not want to go in!

any help would be welcome thanks, please see photo below, the movement is a small ladies FHF 69-21


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The inca setting needs to come out to put a new  spring in. Have a bunch of 69-21 movement plates if you need a one with spring in already. probably easier then fiddling with this tiny springs. 

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