hi, first time for me. Im in to restoration & repair of old buildings, and the best tool iv got for repointing brick or stone is a pointing gun i got from fowler tools bridport UK. Just like a tube of mastic you fill it up then cut the end to the amount of muck you want to come out. Yes it dose get bunged up BUT dose it ever save time. Cost me less than £35 ( just to give you an idear i can repoint about 6sqm aday)