I repair alot of rock drill hammers for one customer. The kits for them cost around $500 and would fit in about 1/2 of a small ziplock bag. Three of the seals have to be stretched over the piston before you can install them down in their respective grooves in the bore. Then you've got to get everything together, and the piston stuck down in the bore before the seals shrink and get cut when you slide it in. Thing is you can't tell any one of the three is cut until you run the machine. I've been lucky and only had that happen once before. That time I drove to the mountains, rebuild the hammer, couldn't test the machine where it was setting, and there was no crew around to move it where it could be tested. I wound up going back the next day...... From that point on I never build a hammer and left the job without it being tested first, regardless of where it was sitting.
Thankfully they did start carrying those particular seals as individuals, for a decent price, otherwise you were looking at a $500 screwup for damaging one little seal. Not too good............
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