Fits like a mouse in your hand to bridge a pool que.   Allows a natural bridge with improved consistency.  It took close to 35 revisions over 6 months to make it small and to fit into a natural application.   It works for either hand.  The design allows to go from the felt and onto the rail with ease.  It is legal for competition.  You should still ask.   There is also the two of the most common radii to monitor the tip.  My first testing was at a friend's house and I won the first 7 games and it wasn't even noticed.  It's even so small you can reach into a pocket to extract the balls.  I put Teflon tape on the wear points.  I also tried hockey stick tape too.   Both tapes worked well.  Print time is about 1 hour and is 6mm thick.   I've only seen one similar tool made for this and it was on Amazn.

pool billiard hand bridge 

pool billard hand bridge v1.obj

Use hole to remove chalk.  Glue on artwork.  Use disk/spacer(s) as needed.

Pool chalk holder 8 sided (verified for Preditor)

Preditor chalk holder.3mf

Use an airline from oxygen mask to fit the connector size of .208" (5.43mm).  You will need to slice the model so the laminations add strength and help make a good shape for the O-ring.  An O-ring about  5/8" outer diameter and 3/8" inside diameter to seal the air.

Neje 30W  air assist

Neje 30w air jet OBJ.obj

About 4" square, for table saw, drill press, or router table.  Has center marking, 1/4" serrations, 1/4" 3/8" 1/2" #8 & #6 drill sizing, 1/4" incremented steps for drill set, R.1/4" & R.1/2", 1/4" hole to drill center of rod.    You need 1/4" X 1" dowels hammered in for the center finder.

Mini square wood work

mini square  wood work obj.obj

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pool billiard hand bridge

Pool chalk holder 8 sided (verified for Preditor)

Neje 30W air assist

Mini square wood work