By edges, yeah, I mean the first and last stitches. There's a tip in SnB about making them be tight, by tugging a bit, maybe I should just be more careful. Or I'll try sammac's method, see if that works better for me.
Hmm, suedonin, it may be I've cast off too tightly, the sleeve does seem to decrease a wee bit at the top for no apparent reason. No way to fix that, is there? I guess I could un-cast-off and try again ...
The sweater is from "Miss Bea's Colours", which is a Rowan book (it's "Gold Star Sweater"). All the sleeves are the same style, with the body of the sweater having a sudden right-angle decrease (really a cast off) where the sleeves start. Hmm, actually, I've had a bit more of a look at it, and maybe it's ok, just a tiny bit short. Measured without any tension, the sleeve "hole" is 7", while the top of the sleeve is 12". So I'm short about 2" of sleeve.
The pattern doesn't say how wide the tops of the sleeves should be, just gives lengths for the sleeves as a whole.
I do understand what you mean about the body decreases, tamum, it's actually a cast off, so it doesn't go down very far, anyway.
The Making up instructions are slightly terse:
Insert square set in sleeves as follows: Sew cast off edge of sleeve top into armhole. Making a neat right angle, sew in straight sides at top of sleeve to cast off stitches at armhole. Join side and sleeve seams using either mattress stitch or batch stitch. It is important to press each of the seams as you make the garment up.
(So far, making up is certainly my least favourite part of knitting.)