I try to avoid blaming scribes for what I don't understand, but sometimes you just gotta wonder about them!

Usually, persevering at looking for meaning with a letter-by-letter transcription yields something. But in context, this will is asking someone to take responsibility for his child if the mother should die or remarry before the child is a certain age, and saying that if John Chambars should fail to perform by reason of death or by negligence of duty, then the support money is still due the child even if it is not received in a timely manner.
AHH-HAAA!! Right in the middle of that ramble, it came to me.... "Saved pure!"
Probably enough blathering for now..
