You can find distributor websites that offer smoking accessories for above types of pipes such as veneers, mugs, and high powered smoking Accessories. You can also purchase Smoking Accessories in Ontario here.
Start by gravity-feeding the pipe to overflowing (sprinkle loose tobacco into the chamber until it mounds up over the top). Next, press the tobacco down until it's compressed down to about the halfway point. Repeat the gravity feed and pack the tobacco down to the 2/3rds to the 3/4 level.
To pack a pipe with tobacco, first, make sure the bowl is clean and dry. Then, loosely pack the bowl with tobacco, tamp it down gently, and light it while puffing slowly.