Door lift cylinder advice

[Timcote1960]

Hi all.

The top door lift for my 1977 P337G N639GC is a bit weak. This causes "door droop" and threatens pre-flight injuries to crew and passengers. It's a small annoyance but a meaningful one. It's a typical gas cylinder but look like it might disassemble and have o-rings and such that could be overhauled.

Best approach? Place to buy a replacement? Overhaul the thing?

Tim