I would suggest that removing the forend counts as disassembly.
Everything is linked on the Enfield and moving one part can have a serious affect on the rest of the 'system'.
Removing the forend (did you do it correctly, or just, 'pull it off'), removing the trigger etc all affects the trigger 'group'.
I remember putting new (old) wood onto a No1 Mk3* Enfield and it would just not 'cock' something was wrong and interfering with the 'trigger group'.
These rifles are not plug & play and the worst thing seems to be that some folk just have to take them apart - and then say "it must have been like that before I started"
What's wrong with "if it 'aint broke don't try and fix it"