Don't unless you can make the screw pressure tight (no I don't know how much pressure. I have made a set of these things and they proved to be useless . the air head above the oil level is like a cylinder and the oil is like a piston. The air has a compression ratio changing the oil level changes that ratio and has a lot to doo with the fork performance like a fie tune for the spring. If you adjustment device causes the loss of this air you fork performance will be dramatically impaired .not improved.
Preload is only done once when you set sag fine adjustment are the mad with the oil level. careful not to go too fare and induce hyd. lock.
Also that thing looks long enough to seriously displace the air in the top of the tube drastically rasing the CR or requiring a lowering on the oil level to maintain a effective CR.
In short, ( should I make it?) answer No
I hate PMs if you want to contact me, find my email address.Look in the for sale section.
Last edited by fog; 7-4-2019 at 1:37 PM.