using adsi edit to change tombstone date

Hi,
We have a domain controller at a remote office site that has gone into tombstone after not replicating for 5months and someone had explained to me that i could use adsi edit in mmc snap ins to change the value of the tombstone.  I actually saw where the entry is under cn=configuration,dc=forestrootdomainname,cn=services and cn=windows NT and after right clicking cn=directoryservice properties i located the tombstoneLifetime under attributes column but did not want to proceed without confirmation of what date i should enter and also if i should even do this since i could also do the dcpromo /forceremoval on the tombstoned domain controller.  Problem is that nobody in that remote site is computer savvy so if i do the adsi edit route i could do it without their help.  I already know the exact date of the last successful replication with that server and also very few changes have been made to active directory since that last replication so it seems this would be a good option.  Would i also still have to remove lingering objects after this step or would it not be necessary?  Thanks.