grouting bag with icing nipple - great idea to keep cleanup to a minimum, especially helpful for black grout & epoxy grout!
Finishing Steps with Mortared Brick - Sand-Set & Mortared Patios - Walkways, Patios, Walls & Masonry. DIY Advice
Easy Tuck Point Using a Masonry Grout Bag - YouTube
BonTool - Poly Grout Bag
Grout Bag. Can be used with thinset for tiny detail work, but is especially great to keep the grouting process neater and cleaner. They have used an cake icing nipple with the latex grout bag.
How to use a grout bag (not that it's hard!)
Repair Damaged Mortar in a Brick Wall - YouTube
Mortar using grout bag, my source for advice on mortar for thin brick
These deep joints can be filled with new mortar using the special grout-bag tool. Once the mortar is stiff, scrape off excess with the small trowel. PHOTO CREDIT: Tim Carter