The whole of the holds base should be in contact with the climbing surface. If the hold is too big for the placement and touches feature, there is a possibility of the hold chipping or breaking due to the point loading when it is tightened.

Also on curved GRP walls, if not enough of the base is in contact with the climbing surface, the hold could spin when loaded. It is therefore essential that great care is taken to select the correct size hold for the chosen location.

A 6mm Allen key is required to tighten the bolts. The bolt must be threaded into the T nut by at least 10mm.

Bolts should be screwed in until the hold becomes tight, spin the hold to the angle you want to set it at, e.g. undercut/slide pull. Then slowly tightened a further half turn. This should be sufficient to secure the hold. Try and spin the hold to the left with both hands. If the hold moves, tighten it with a further quarter turn. Repeat this procedure until the bolt on hold is tightened.

Use an allen key to nip up the bolts as you can't get enough leverage with a T bar. If you use a cordless screwdriver make sure you use the torque setting.

On new ply wood climbing walls, the T nuts need to bed into the back of the wood. As you tighten the bolt the T nut is pulled into the wood. When you climb on the holds your weight pulls the nut in a bit further, sinking the T nut into the wood by a few mm, which causes the hold to seem loose and spin, so keep checking holds after you have set them on new walls, till the wall beds in.

DO NOT over tighten small holds as they can break.