Note: Over time burrs can form on the drive shafts/coreholder shafts causing them to not sit flush with the top of the system. To remove any burrs from the drive shaft/coreholder shaft, follow the instructions below. If not removed this could cause the coreholder to get stuck in the system.
1) Use a .625” reamer to ream out the internal portion of the shaft. Do not use a drill, clamp a set of vice grips onto the shaft of the reamer.
2) Turn reamer by hand until reamer has bottomed out on the internal pin (approximately 2.25” down). Remove reamer and use compressed air to blow the debris out.
3) Next remove burrs from the coreholder shaft. Using a file, file around the edges on the bottom of the shaft (there should not be any sharp edges).
4) Place coreholder into system, if coreholder does not sit flush repeat the steps above.
To download the procedure for removing burrs from WT-30 and WT-35 drive shafts, click the link below.