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Haven’t ever done that on a Blodgett. Simply don’t see many of them.
Looking at their parts diagram, it appears their spring-assisted lid hinge very similar to a Cleveland. Here’s Cleveland’s instructions:
Appears that Blodgett’s design lacks the slotted screws that Cleveland mentions.
I can’t be for sure, but looks like item #3 serves to adjust the tension. I imagine that #3 accepts a large Allen wrench (maybe a 3/8″ too?). I can’t tell for sure from the illustration, so that’s only my guess.
Item #1 is the stop pin. So…rotating #3 slightly CCW (opposite Cleveland’s instructions) will release tension on the stop pin so you can remove it.
Item #3 looks like it has multiple holes on its periphery. Using that wrench, rotate #3 CCW to tighten or CW to loosen spring tension. Once it’s to your liking, align the hole in #2 with nearest available one in #3, then re-insert the locking pin.
NOTE: If you discover that the spring is broken, I suggest ordering #1 along with the new spring. Otherwise, just be mindful that item #1 should be replaced anyway if it’s showing some wear or damage.
