Starrett Protractor Square Stuck Tight

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Forum topic by LoyalAppleGeek posted 08-12-2017 10:54 PM 1891 views 0 times favorited 6 replies Add to Favorites Watch
View LoyalAppleGeek's profile


160 posts in 1741 days

08-12-2017 10:54 PM

Topic tags/keywords: tool fix square protractor angle free restore clean rust question

Greetings and salutations Lumberjocks!

I recently acquired a 3 piece Starrett Combination Square set with 24” blade for free! It’s in pretty good shape, just a little clean up is needed. I can’t for the life of me unstick the protractor though. It doesn’t look corroded where it rotates, but no amount of oil and pressure I can safely apply seems to be helping. Any ideas?

Thank you!

6 replies so far

View TungOil's profile


1382 posts in 1342 days

#1 posted 08-13-2017 01:07 AM

One of my combinations squares sticks like that also. I find that if I unscrew the knurled knob a turn or two then push it down very hard towards the rule it will loosen up. it can take quite a bit of force to break it free. In my case, the little tab that rides in the groove of the rule is damaged and tends to stick/jam. Worth a try.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View bc4393's profile


95 posts in 1989 days

#2 posted 08-13-2017 02:18 AM

Take that thumbscrew out that you can see the end of in your pic that holds the rotation. You should be able to push out the circular insert in the center of the protractor. Sometimes it takes a bit of oomph. Make sure you have the stem completely removed that grabs the blade first. I’m assuming it rotates. If it doesn’t even do that soak it with kraxit and let it sit overnight. Free up the rotation first using the blade as leverage. Then pop it out. I’ve cleaned up more of those than I can remember. That one doesn’t look too bad.

View LoyalAppleGeek's profile


160 posts in 1741 days

#3 posted 08-13-2017 03:25 AM

I’ve tried all of the above, including using the blade as leverage. Looks like a soak is in order! Thanks guys :)

View Woodknack's profile


13471 posts in 3227 days

#4 posted 08-13-2017 08:23 AM

If all else fails, heat. It would be my last resort because those rules are hardened steel and it could throw them out of whack or even ruin the temper. But at some point you have nothing to lose.

-- Rick M,

View MrRon's profile


5931 posts in 4090 days

#5 posted 08-13-2017 07:30 PM

You might try contacting customer service at Starrett. They might be able to tell you how to free it up.

View LoyalAppleGeek's profile


160 posts in 1741 days

#6 posted 09-23-2017 03:18 AM

Customer Service isn’t a bad idea. I’ll give that a try.

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