What writing utensil fits tight in this? A mechanical and No. 2 pencil can move and cause a wavy centering line.

I use one of the thicker round, not hexagonal pencils. Maybe try a couple wraps of electrical tape.

can you recommend a mechanical pencil that will fit the holes on this perfectly without wiggle room for the most accurate center line?

The holes should be smaller to fit at .5mm lead. I would try a 1.3mm lead. They are hard to find.

Is it possible to order a replacement pin?

I'm sure you can get them from the makers but since they are 1/4 inch in diameter I would just go to the hardware store and get a 1/4 inch bolt. Get one that has an unthreaded shank as long as you need and cut the threaded part off. It would be a lot cheaper and it works just as well. That's what I've done.

Manufacturer	DFM Tool Works
Part number	DFM Small Square
Item Weight	70 g
Product Dimensions	6.68 x 4.14 x 1.6 cm; 70 g
Manufacturer reference	DFM Small Square
Colour	Blue
Style	Square
Material	Aluminium
Item thickness	1.63 Inches
Measurement Accuracy	.001 in
Included components	Centerfinding Pins QTY 2
Batteries included?	No
Batteries Required?	No

Small Square and Center Finder - Mini Tool With 11/32" Center Marking Hole for Woodworking, Carpenter Engineering, Made in USA - Blue

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