Just a mention for anyone who might be interested in miter spring clamps to pull together hardwood and plywood edge miters, picture frames, …

Tried a kit from one of the major woodworking mailorder/retailstore companies and was very dissatisfied – the smallest clips were too weak, the largest too large, all left big holes, and some weren’t sharp enough to catch the wood.

Then found a different design from www.collinstool.com. With their spreader tool, opens as much as 2″. Pretty good closing force, points are ground to fine point leaving smaller hole and good catching, … Worked extremely well with their spreader tool, which is almost a must. You can purchase directly from the manufacturer, or from any of several retail outlets and internet sites listed on their web site given above.

Good joints are a must, but I was pulling together plywood stands as large as 12″x14″x42″ with a spring clamp about every 6″. The best adhesive was two part epoxy or urea formaldehyde – with PVA, between quick tack and moisture expanding the 1/8″ plywood spline there wasn’t enough time to put the four sides together, clamp, check for square and twist and correct.