if your workbench has holes for 'dog' these hold downs work very well. i use one on my shave horse
www.axminstertools.com

Veritas Bench Hold Down
Exceptionally high clamping forces can be obtained with this hold down. The arm is free to pivot independently, all levered forces are exerted downward, without any loss due to horizontal slippage from the canting action of the hold down post. The fine...