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Section 9: Tightening

Time needed: approximately 30 minutes

This step is best done with two people, however it can be

done with one. Look inside the tub and check that any

gaps between staves are evenly distributed around the

circumference of the tub. If necessary, use your mallet to

strike the staves from the inside using a glancing blow to

adjust the gaps around the perimeter of the tub to achieve

even distribution.

Now you can tighten each strap a little at a time - starting

with the bottom one. Tighten the staves in stages -

bottom first, then upper(s); this will be repeated several

times. One person will be tightening the bolt clamp as the

other person uses the rubber mallet and starts on the side

opposite the bolts, rapping each stave with moderate

force just above the lower strap where the staves and

floor join, driving them inward.

Always start opposite the bolts and do one half of the tub,

then the other. Take up the slack in the bands with the

bolts as you do this. The staves should be driven on

slowly. The object is to set the staves evenly around the

tub. Work from the opposite side toward the bolts in one

direction, then from the opposite side toward the bolts in

the other direction. In this way the tub is tightened

evenly.

Work around the tub, hitting each stave with a firm rap

right on the bottom strap. You will see each stave seat a

little tighter. After one round of tightening the bottom

strap, stop and take up slack in the upper strap(s). Note:

do not over tighten the upper straps; they do not require

as much tension as the bottom one.

Fig 8.2

Figure 9.1 Hitting staves directly on the strap.

Check the placement of the straps now before things get

too tight. It is easier to move the straps now. Use a tape

measure to adjust the straps so they are placed as shown

in Figure 9.2. Step back and make sure that the straps look

level. Adjust as needed.

Now do another round of rapping with the mallet. This

time hitting each stave a little harder - a good full swing on

each one as your helper tightens the bolts.

tightening each strap a little bit, so that you can keep the

tension on the upper straps less than the bottom one.

Fig. 9.2 Hitting straps hard all around while tightening.

Figure 9.3 Using power driver to tighten. Stop when you

see noticeable deflection of the aluminum blocks. This

indicates bottom strap is tight enough. Upper straps

should not be as tight.

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