Thanks Heinrich. Yes that really helps a lot. The seat can go up in the air by 1 meter.
The scroll saw got a maintenance check, Take it complete apart, cleaned everything and get the rust of the parts. Sanded the working table till it was smooth. All moving parts got new grease.
Then I make a wooden board under it with rubber feet. The weight of the saw is almost 30 kilogram!!!
And I make a dust suction on it.
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Not bad for a 32 years old machine. Tomorrow I got my saw blades for it. So I can test it.