Just a tip for using a bench capper. Bottles are slightly different heights. Pressure is no longer exerted on the bell plunger if this gap on the capper body closes during capping process. All of the force exerted on the lever is transferred to the capper body. This may result in an insufficient crimp on the cap and loss of CO2 in the bottle over time. The pressure transferred to the capper body may also cause stress fractures.
My capper is the old style Agata with locking points on the column. I cut vinyl discs to raise some style of bottles up for positive capping pressure. New Belgium Celebration bottles are the worst for being in between the locking points.
I suspect this would apply to other brands of bench cappers also.