"Dave Plowman (News)" wrote:

However, if it's properly put up using Rawlbolts, it could be removed
easily with no damage to the wall.

If you need to drill large diameter holes in masonary then it can be
best to start with a small hole and enlarge it. Also don't use hammer
unless you need to. A small drill bit is less likely to wander. If you
already have a 4mm hole then it can be very easy to enlarge it in 1 or
2 mm steps, even in fairly hard materials.

With Rawlbolts first make the hole big and deep enough to fit the
bolt then enlarge the first part of the hole to accomodate the shield.

e.g. with an M6 10L have a 6.5/7mm 55mm deep with the first 45mm expanded
to 12mm.

That way the shield should be unable to move forwards or backwards in the
hole whilst as much of the bolt which needs to being able to extend beyond
the shield. Without any possibility of the bolt "hitting bottom".

Ensure that the hole is free of dust. (Especially if the only practical
method of fixing is to put the shields in the holes separate from the
bolts.)