Jingle

I would just put a pin to match the bottoms together. Although I don't need to, I just hold them together while they go under the needle.

shasta5718

There is always the good old pin. It is worth the time to use these if you are having trouble with all.

joe'smom

When I'm sewing two triangles together (rather than working with the squares), I've started to put a dot of Glue Baste-It in the seam line at the tip. This has really helped cut down on slippage and points getting chewed up.

marybs

http://www.thangles.com/howtheywork.html
Thangles are a great way to get a bunch of hs triangles done if you are doing lots with the same colors.

quilterpurpledog

We know the bias will twist-but you need to be in the driver's seat to keep it from happening. I pin mine in three places and I use a stiletto to keep the bias edges together as they pass through the machine-it is essential to the outcome of the HST.

rryder

I'm a big fan of starch. Even when I make half square triangles using the square, diagonal line, stitch 1/4" on each side of line method, I still starch my fabric until it is stiff. It helps stabilize the bias which can stretch even using the square method-- and I think you get nicer looking stitches with stiff fabric. Also, it makes it a lot easier to get good crisp pressed seam allowances if you are pressing to the side and that makes it easier to get everything lined up when putting together your blocks.

Rob

Pennyhal

I always make them 1/4" larger then trim them down to size. I have yet to master getting pieces sewn together the exact size they are suppose to be.

quilting cat

I'm currently doing a bunch with Thangles, and find I don't need to trim results like I do with pre-cut triangles.